- caducocincta May, 1916 = Mesoginella caducocincta (family Marginellidae – Marginellinae)

- caerulea Reeve, 1850 = Dosinia caerulea (family Veneridae – Dosiniinae)

- caesura Colman, 1958 = Fustiaria caesura (family Fustiariidae)

- calamus Crosse & Fischer, 1864 = Eoacmaea calamus (family Lottiidae – Patelloidinae)

- californica Tryon, 1886 = Bostrycapulus pretzgeri (family Calyptraeidae)

- calliozona Pilsbry, 1894 = Rhyssoplax calliozona (family Chitonidae – Chitoninae)

- caloundra Iredale, 1930 = Mactra contraria (family Mactridae – Mactrinae)

- calumus Rudman and Avern, 1989 = Rostanga calumus (family Discodorididae)

- calva Tate, 1887 = Cyclocardia calva (family Carditidae)

- calva Verco, 1906 = Phenacolepas calva (family Phenacolepadidae)

- calva Verco, 1910 = Retizafra calva (family Columbellidae – Atiliinae)

- calyptraeformis Lamarck, 1822 = Calyptraea calyptraeformis (family Calyptraeidae)

- calyx Young, 1972 = Chiroteuthis calyx (family Chiroteuthidae)

- cambrica Iredale, 1936 = Austrocardiella trifoliata (family Condylocardiidae – Condylocardiinae)

- cameroni Allan, 1947 = Doris cameroni (family Dorididae)

- cameroni Burn, 1966 = Noumea haliclona (family Chromodorididae)

- campanula Burn, 1978 = Cylichnatys campanula (family Haminoeidae – Atydinae)

- campbellicus Odhner, 1924 = Zygochlamys delicatula (family Pectinidae – Chlamydinae)

- cana Verco, 1909 = Eutriphora cana (family Triphoridae – Triphorinae)

- cancellata Coton, 1930 = Pronucula mayi (family Nuculidae)

- cancellata Crioscino & Ponder, 2011 = Merelina cancellata (family Rissoidae – Rissoinae)

- cancellata Tenison Woods, 1878 = Crossea cancellata (family Turbinidae – Skeneinae)

- cancellatus Beddome, 1882 = Exomilus cancellatus (family Conidae – Rhaphitominae)

- candida A. Adams, 1851 = Emarginula candida (family Fissurellidae – Emarginulinae)

- candida Deshayes, 1853 = Callista disrupta (family Veneridae – Pitariinae)

- capax Finlay, 1927 = Charonia lampas rubicunda (family Ranellidae – Cymatiinae)

- capensis O’Donoghue, 1929 = Aplysia juliana (family Aplysiidae – Aplysiinae)

- caperatus Tate & May, 1900 = Petaloconchus caperatus (family Vermetidae – Vermetinae)

- capiticava Hedley & May, 1908 = Liostomia capiticava (family Pyramidellidae – Odostomiinae)

- capreolata Montrouzier, 1859 = Janthina exigua (family Janthinidae)

- captiva Hedley, 1907 = Gazameda declivis (family Turritellidae – Turritellinae)

- cardioides Lamarck, 1818 = Timoclea cardioides (family Veneridae – Chioninae)

- carditoides Lamarck, 1818 = Irus carditoides (family Veneridae – Tapetinae)

- carinata Hedley, 1903 = Cirsonella carinata (family Turbinidae – Skeneinae)

- carinatus Perry, 1811 = Phasianotrochus eximius (family Trochidae – Trochinae)

- carinulatus Reeve, 1847 = Ischnochiton carinulatus (family Ischnochitonidae – Ischnochitoninae)

- cariosus Pilsbry, 1892 = Ischnochiton cariosus (family Ischnochitonidae – Ischnochitoninae)

- carmeli Tenison Woods, 1877 = Conus anemone (family Conidae – Coninae)

- carneola Angas, 1864 = Doriopsilla carneola (family Dendrodorididae)

- caroli Iredale, 1929 = Mesopeplum fenestratum (family Pectinidae – Chlamydinae)

- carpenteri Mörch, 1860 = Janthina janthina (family Janthinidae)

- casearia Hedley & Petterd, 1906 = Lucerapex casearia (family Turridae – Turrinae)

- cassandra Hedley, 1904 = Aesopus cassandra (family Columbellidae – Atiliinae)

- casta A. Adams, 1851 = Leucotina casta (family Amathinidae)

- casta Schilder & Summers, 1963 = Notocypraea comptoni (family Cypraeidae – Pustulariinae)

- castanea A. Adams, 1853 = Mitra badia (family Mitridae – Mitrinae)

- castanea Anderson, 1836 = Notocypraea angustata (family Cypraeidae – Pustulariinae)

- castanea Laseron, 1950 = Eatoniopsis castanea (family Cingulopsidae)

- catenoides May, 1919 = Polinices catenoides (family Naticidae – Naticinae)

- cavatica Hedley, 1902 = Venericardia cavatica (family Carditidae)

- cento Laseron, 1956 = Diala suturalis (family Dialidae)

- cereum Sowerby, 1855 = Seila crocea (family Cerithiopsidae – Seilinae)

- cerevisina Hedley, 1919 = Tonna variegata (family Tonnidae – Tonninae)

- cericosta Laseron, 1951 = Austromitra tasmanica (family Costellariidae)

- cerithium Quoy & Gaimard, 1834 = Zeacumantus diemenensis (family Batillariidae)

- cessens Verco, 1908 = Warrana cessens (family Condylocardiidae – Cuninae)

- cessicus Hedley, 1906 = Tubercliopsis cessicus (family Cerithiopsidae – Cerithiopsinae)

- cf hacketti Cotton & Godfrey, 1933 = Tornatina cf hacketti (family Cylichnidae)

- cf. dux Steenstrup, 1857 = Architeuthis cf. dux (family Architeuthidae)

- chamoides Stutchbury, 1830 = Cleidothaerus albidus (family Cleidothaeridae)

- chapmani Gatliff & Gabriel, 1912 = Puyseguria chapmani (family Neoleptonidae)

- chapmani Tenison Woods, 1876 = Scutellastra chapmani (family Patellidae)

- charopa Tate, 1899 = Microdiscula charopa (family Orbitestellidae)

- cheilostoma Tenison Woods, 1877 = Merelina cheilostoma (family Rissoidae – Rissoinae)

- chiastos Scheltema, 1989 = Lepoderma chiastos (family Chaetodermatidae)

- chrysoderma Angas, 1864 = Neodoris chrysoderma (family Dorididae)

- cicatricosa A. Adams, 1851 = Tugali cicatricosa (family Fissurellidae – Emarginulinae)

- cicatricosus Philippi, 1843 = Bembicium auratum (family Littorinidae – Lacuninae)

- cimolius Reeve, 1847 = Lorica volvox (family Schizochitonidae)

- cincta Angas, 1867 = Rissoina fasciata (family Rissoidae – Rissoininae)

- cinerea Hedley, 1903 = Monophorus nigrofuscus (family Triphoridae – Triphorinae)

- cinnamomea A. Adams, 1855 = Austromitra analogica (family Costellariidae)

- circinaria Deshayes, 1853 = Dosinia circinaria (family Veneridae – Dosiniinae)

- circularis Reeve, 1848 = Turbo gruneri (family Turbinidae – Turbininae)

- circumlabra Ponder & Yoo, 1976 = Pisinna circumlabra (family Anabathridae)

- circumligata Verco, 1910 = Colpospira circumligata (family Turritellidae – Turritellinae)

- circumsuta Cox, 1883 = Saccostrea cucullata glomerata (family Ostreidae – Crassostreinae)

- clarkei Tenison Woods, 1876 = Tasmeuthria clarkei (family Buccinidae – Buccininae)

- clarus E. A. Smith, 1881 = Conus clarus (family Conidae – Coninae)

- clathrata Kiener & Fischer, 1873 = Gazameda iredalei (family Turritellidae – Turritellinae)

- closei Rudman, 1986 = Noumea closeorum (family Chromodorididae)

- closeorum Rudman, 1986 = Noumea closeorum (family Chromodorididae)

- clovei Rochebrune, 1884 = Brachioteuthis riisei (family Brachioteuthidae)

- coacta Watson, 1886 = Koloonella coacta (family Pyramidellidae – Unplaced)

- coccoradiata Reeve, 1846 = Haliotis coccoradiata (family Haliotidae)

- cognata Pritchard & Gatliff, 1899 = Antiguraleus kingensis (family Conidae – Mangeliinae)

- colmani Palmer, 1974 = Bathoxiphus colmani (family Entalinidae)

- columnaria Cotton & Woods, 1935 = Glyptozaria opulenta (family Cerithiidae – Cerithiinae)

- columnaria Hedley & May, 1908 = Hydroginella columnaria (family Marginellidae – Marginellinae)

- columnaria Hedley & May, 1908 = Philine columnaria (family Philinidae)

- columnaria Hedley & May, 1908 = Sassia columnaria (family Ranellidae – Cymatiinae)

- columnaria Hedley & May, 1908 = Venericardia columnaria (family Carditidae)

- columnaria Hedley, 1922 = Filodrillia columnaria (family Conidae – Clathurellinae)

- columnaria Hedley, 1922 = Mitromorpha columnaria (family Conidae – Clathurellinae)

- columnaria May, 1915 = Hebeulima columnaria (family Eulimidae)

- columnaria May, 1915 = Zafra columnaria (family Columbellidae – Atiliinae)

- columnarium Hedley & May, 1908 = Calliostoma columnarium (family Calliostomatidae – Calliostomatinae)

- columnarius Hedley & May, 1908 = Benthoxystus columnarius (family Muricidae – Trophoninae)

- columnarius Hedley & May, 1908 = Epigrus columnarius (family Epigridae)

- columnarius Hedley & May, 1908 = Leptochiton columnarius (family Lepidopleuridae)

- coma Cotton, 1953 = Alaba pulchra (family Litiopidae)

- coma Odhner, 1924 = Peculator porphyria (family Volutomitridae)

- cometa Middlefart, 2002 = Condylocardia cometa (family Condylocardiidae – Condylocardiinae)

- comiat Iredale, 1924 = Pugillaria stowae (family Siphonariidae)

- comma Verco, 1908 = Warrana comma (family Condylocardiidae – Cuninae)

- commensalis Tate, 1898 = Curveulima commensalis (family Eulimidae)

- commercialis Iredale & Roughley, 1933 = Saccostrea cucullata glomerata (family Ostreidae – Crassostreinae)

- communis Hedley, 1906 = Cyamiomactra communis (family Cyamiidae)

- compacta Angas, 1865 = Nassarius pauper (family Nassariidae – Nassariinae)

- compacta Gabriel, 1962 = Nassarius mobilis (family Nassariidae – Nassariinae)

- compacta Petterd, 1884 = Liotella compacta (family Turbinidae – Skeneinae)

- complexa Iredale, 1924 = Myadora complexa (family Myochamidae)

- complinata Iredale, 1924 = Patelloida alticostata (family Lottiidae – Patelloidinae)

- compositis Maybloom, 1951 = Fusinus undulatus (family Fasciolariidae – Fusininae)

- compressa Hedley & May, 1908 = Cunanax compressa (family Condylocardiidae – Condylocardiinae)

- compressa Lamarck, 1818 = Donax deltoides (family Donacidae)

- compta A. Adams & Angas, 1864 = Marita compta (family Conidae – Mangeliinae)

- compta Deshayes, 1855 = Gari livida (family Psammobiidae)

- comptoni Gray, 1847 = Notocypraea comptoni (family Cypraeidae – Pustulariinae)

- concamerata May, 1918 = Persicula pulchella (family Cystiscidae – Persiculinae)

- concamerata Wood, 1828 = Diloma concamerata (family Trochidae – Trochinae)

- concatenatus Crosse & Fischer, 1864 = Cosmetalepas concatenatus (family Fissurellidae – Fissurellinae)

- concava Sowerby, 1869 = Aplysia parvula (family Aplysiidae – Aplysiinae)

- concentrica A. Adams & Angas, 1865 (non Lamarck) = Callucina lacteola (family Lucinidae)

- concentrica Cotton, 1930 = Pronucula pusilla (family Nuculidae)

- concentrica Hedley, 1902 = Cuna concentrica (family Condylocardiidae – Cuninae)

- concentrica Verco, 1907 = Huxleyia concentrica (family Nucinellidae)

- concentricus Reeve, 1847 = Rhyssoplax jugosa (family Chitonidae – Chitoninae)

- concinna A. Adams, 1854 = Leucotina casta (family Amathinidae)

- concinna Angas, 1868 = Crossea concinna (family Turbinidae – Skeneinae)

- condita Ponder & Yoo, 1980 = Eatonina condita (family Cingulopsidae)

- confusa robertsoni Ponder & Yoo, 1977 = Rissoella confusa robertsoni (family Rissoellidae)

- confusa E. A. Smith, 1898 = Coxiella striata (family Pomatiopsidae – Pomatiopsinae)

- confusus Angas, 1871 = Limnoperna securis (family Mytilidae)

- conica Gray, 1827 = Thalotia conica (family Trochidae – Trochinae)

- conica Lamarck, 1822 = Polinices conica (family Naticidae – Naticinae)

- conicus Angas, 1864 = Trimusculus conicus (family Trimusculidae)

- connectans May, 1911 = Cystiscus connectans (family Cystiscidae – Cystiscinae)

- connectens Sowerby, 1897 = Guraleus cuspis (family Conidae – Mangeliinae)

- conoidea Reeve, 1842 = Montfortula rugosa (family Fissurellidae – Emarginulinae)

- consettiana Iredale, 1930 = Epicodakia consettiana (family Lucinidae)

- consobrina A. Adams & Angas, 1863 = Ennucula obliqua (family Nuculidae)

- consobrina May, 1911 = Mesoginella consobrina (family Marginellidae – Marginellinae)

- consobrina May, 1915 = Crossea concinna (family Turbinidae – Skeneinae)

- consobrina May, 1915 = Icuncula consobrina (family Capulidae)

- consobrina May, 1923 = Brookula crebresculpta (family Turbinidae – Skeneinae)

- consobrina Tate & May, 1900 = Austrorissopsis consobrina (family Aclididae)

- conspersus A. Adams, 1853 = Clanculus philippi (family Trochidae – Trochinae)

- constricta Lamarck, 1822 = Austrocochlea constricta (family Trochidae – Trochinae)

- constricta Reeve, 1863 = Laternula laterna (family Laternulidae)

- constrictus Quoy & Gaimard, 1834 (in part) = Austrocochlea brevis (family Trochidae – Trochinae)

- constrictus Quoy & Gaimard, 1834 (in part) = Austrocochlea porcata (family Trochidae – Trochinae)

- contabulata Tate, 1899 = Lissotesta contabulata (family Turbinidae – Skeneinae)

- contabulatum Frauenfeld, 1867 = Anabathron contabulatum (family Anabathridae)

- contermina Iredale, 1936 = Mitra badia (family Mitridae – Mitrinae)

- conterminus Iredale, 1925 = Fusus schoutanicus (family Colubrariidae)

- contorta Carpenter, 1857 = Janthina janthina (family Janthinidae)

- contractus Reeve, 1847 = Ischnochiton contractus (family Ischnochitonidae – Ischnochitoninae)

- contraria Reeve, 1854 = Mactra contraria (family Mactridae – Mactrinae)

- controversa Pritchard & Gatliff, 1913 = Polinices controversa (family Naticidae – Naticinae)

- conturbatum Iredale, 1936 = Ataxocerithium serotinum (family Newtoniellidae – Ataxocerithiinae)

- contusiformis Basedow, 1905 = Mysticoncha wilsoni (family Velutinidae – Lamellariinae)

- conularis Lamarck, 1818 = Katelysia scalarina (family Veneridae – Tapetinae)

- cooki Angas, 1864 = Paliolla cooki (family Gymnodorididae)

- coppingeri E.A. Smith, 1884 = Ischnochiton fruticosus (family Ischnochitonidae – Ischnochitoninae)

- corbuloides Reeve, 1854 = Spisula trigonella (family Mactridae – Mactrinae)

- cordismei Watson, 1881 = Colpospira cordismei (family Turritellidae – Turritellinae)

- cornea Swainson, 1855 = Ophicardelus ornatus (family Ellobiidae – Ellobiinae)

- corolla Verco, 1908 = Puncturella corolla (family Puncturellidae)

- coronata Lamarck, 1822 = Pleuroploca australasia (family Fasciolariidae – Fasciolariinae)

- coronatus Verrill & E. A. Smith, 1882 = Placiphorella atlantica (family Mopaliidae)

- correctus Iredale, 1937 = Solen vaginoides (family Solenidae)

- corrodenda May, 1920 = Notoacmea corrodenda (family Lottiidae – Lottiinae)

- corrosa Oliver, 1926 = Notoacmea alta (family Lottiidae – Lottiinae)

- corrugata Lamarck, 1818 (non Gmelin, 1791) = Katelysia rhytiphora (family Veneridae – Tapetinae)

- corticalis Tate, 1889 = Tylodina corticalis (family Tylodinidae)

- coryne A. Adams, 1855 = Dosinia caerulea (family Veneridae – Dosiniinae)

- cosmoi Dautzenberg, 1921 = Niveria globosa (family Triviidae)

- costata A. Adams & Angas, 1864 = Notoplax costata (family Acanthochitonidae – Acanthochitoninae)

- costata Blainville, 1825 = Plaxiphora albida (family Mopaliidae)

- costata Hedley & May, 1908 = Nassarius mobilis (family Nassariidae – Nassariinae)

- costata Hedley, 1911 = Pisinna costata (family Anabathridae)

- costata Lamarck, 1801 = Petricola divergens (family Petricolidae)

- costifera May, 1919 = Mitromorpha costifera (family Conidae – Clathurellinae)

- costulata Wood, 1828 = Tawera gallinula (family Veneridae – Chioninae)

- cothurnata Iredale, 1936 = Tanea sagittata (family Naticidae – Naticinae)

- cottesloensis Cotton, 1929 = Sepia hedleyi (family Sepiidae)

- cottoni Laseron, 1956 = Modiolus areolatus (family Mytilidae)

- covra Bergmans, 1978 = Nucula covra (family Nuculidae)

- coxi Angas, 1867 = Notogibbula bicarinata (family Trochidae – Trochinae)

- coxi Angas, 1867 = Vexitomina coxi (family Turridae – Crassispirinae)

- coxi Brazier, 1872 = Humphreyia strangei (family Clavagellidae)

- coxi Pilsbry, 1894 = Acanthochitona coxi (family Acanthochitonidae – Acanthochitoninae)

- coxi Pilsbry, 1897 = Serracorbula coxi (family Corbulidae – Corbulinae)

- coxi Pilsbry, 1899 = Hypermastus coxi (family Eulimidae)

- crassa Dunker, 1861 = Bembicium nanum (family Littorinidae – Lacuninae)

- crassa Hinds, 1843 = Nuculana crassa (family Nuculanidae – Nuculaninae)

- crassa Tenison Woods, 1877 = Limnoperna pulex (family Mytilidae)

- crassicosta May, 1916 = Odostomia crassicosta (family Pyramidellidae – Odostomiinae)

- crassicostata Suter, 1909 = Terebra tristis (family Terebridae – Terebrinae)

- crassidentata Cotton, 1930 = Cunanax crassidentata (family Condylocardiidae – Condylocardiinae)

- crassilirata Tate, 1887 = Cardiolucina crassilirata (family Lucinidae)

- crassina Angas, 1880 = Etrema denseplicata (family Conidae – Clathurellinae)

- crassior Philippi, 1847 = Austrolittorina unifasciata (family Littorinidae – Littorininae)

- cratericulus Tate & May, 1900 = Cystiscus cratericulus (family Cystiscidae – Cystiscinae)

- crawfordi Burn, 1969 = Discodoris crawfordi (family Discodorididae)

- crebrelamellatus Tate, 1887 = Irus crebrelamellatus (family Veneridae – Tapetinae)

- crebresculpta Tate, 1899 = Brookula crebresculpta (family Turbinidae – Skeneinae)

- creccina Reeve, 1860 = Laternula creccina (family Laternulidae)

- crenatuliferus Tate, 1892 = Micromytilus crenatuliferus (family Philobryidae)

- crenatus Lamarck, 1818 = Irus crenatus (family Veneridae – Tapetinae)

- crenulifera Tate, 1892 = Turbonilla tasmanica (family Pyramidellidae – Turbonillinae)

- crescere Laseron, 1948 = Alaginella ochracea (family Marginellidae – Marginellinae)

- cretacea Angas, 1867 = Spisula trigonella (family Mactridae – Mactrinae)

- crocea Angas, 1871 = Seila crocea (family Cerithiopsidae – Seilinae)

- crocea Deshayes, 1853 = Dosinia crocea (family Veneridae – Dosiniinae)

- crocinum Dall, 1907 = Laevidentalium crocinum (family Calliodentaliidae)

- crocinus Reeve, 1847 = Callochiton crocinus (family Ischnochitonidae – Callochitoninae)

- crotaphis Watson, 1886 = Scalenostoma lodderae (family Eulimidae)

- crucis Beddome, 1882 = Amblychilepas crucis (family Fissurellidae – Fissurellinae)

- crucis Tenison Woods, 1876 = Patelloida insignis (family Lottiidae – Patelloidinae)

- cryptozoica Hedley, 1917 = Scintillona cryptozoica (family Galeommatidae)

- cucullata glomerata Gould, 1850 = Saccostrea cucullata glomerata (family Ostreidae – Crassostreinae)

- cucullata Hedley, 1910 = Saccostrea cucullata glomerata (family Ostreidae – Crassostreinae)

- cultrata Gould, 1861 = Thraciopsis angustata (family Thraciidae)

- cultrata Hoyle, 1885 = Sepia cultrata (family Sepiidae)

- cumingi A. Adams & Angas, 1863 = Divalucina cumingi (family Lucinidae)

- cumingii Deshayes, 1854 = Irus cumingii (family Veneridae – Tapetinae)

- cunaeformis May, 1915 = Melanella cunaeformis (family Eulimidae)

- cuneata Lamarck, 1818 = Paphies cuneata (family Mesodesmatidae – Mesodesmatinae)

- cuneata Laseron, 1948 = Dentimargo jaffa (family Marginellidae – Marginellinae)

- cuneiformis Spengler, 1783 = Gastrochaena cuneiformis (family Gastrochaenidae)

- curvamen Iredale, 1925 = Emarginula curvamen (family Fissurellidae – Emarginulinae)

- cuspis Sowerby, 1897 = Guraleus cuspis (family Conidae – Mangeliinae)

- cycladea Lamarck, 1818 = Anapella cycladea (family Mesodesmatidae – Davilinae)

- cyclostoma rosea Tenison Woods, 1877 = Pisinna approxima (family Anabathridae)

- cyclostoma Tenison Woods, 1877 = Pisinna frenchiensis (family Anabathridae)

- cydippe A. Adams, 1855 = Dosinia caerulea (family Veneridae – Dosiniinae)

- cygnea Bergh, 1876 = Armina cygnea (family Arminidae)

- cygnorum Deshayes, 1855 = Acrosterigma cygnorum (family Cardiidae – Trachycardiinae)

- cylindraceus Tenison Woods, 1878 = Epigrus cylindraceus (family Epigridae)

- cylindricum Watson, 1886 = Socienna cylindricum (family Newtoniellidae – Eumetulinae)

- cymbalum Tate, 1878 = Cystiscus cymbalum (family Cystiscidae – Cystiscinae)

- cymodocealis Ashby, 1918 = Stenochiton cymodocealis (family Ischnochitonidae – Ischnochitoninae)

- cypraeformis Tenison Woods, 1878 = Ovaginella ovulum (family Marginellidae – Marginellinae)

- cypraeoides Tenison Woods, 1878 = Ovaginella ovulum (family Marginellidae – Marginellinae)

- cyprinoides Joubin, 1894 = Ctenopteryx siculus (family Ctenopterygidae)

- cytaeum Hutton, 1873 = Anomia trigonopsis (family Anomiidae – Anomiinae)