Cabestana (rock-whelks)

Cacozeliana (creepers)

Cadlina (sea-slugs)

Cadulus (tusk-shells)

Caldukia (sea-slugs)

Calliobasis (top-shells)

Calliodentalium (tusk-shells)

Calliostoma (top-shells)

Callista (callistas)

Callistochiton (chitons)

Callochiton (chitons)

Callucina (lucines)

Calyptraea (shelf-limpets)

Cancellaria (nutmeg-shells)

Cantharidella (kelp-shells)

Capulus (cap-shells)

Cardiocardita (false-cockles)

Cardiolucina (lucines)

Cardita (false-cockles)

Carditellopsis (false-cockles)

Carinastele (top-shells)

Cavolinia (sea-butterflies)

Cellana (limpets)

Ceratosoma (sea-slugs)

Cerberilla (sea-slugs)

Chama (jewel-boxes)

Charisma (top-shells)

Charonia (rock-whelks)

Chicoreus (murex-shells)

Chiroteuthis (squids)

Chiton (chitons)

Chlorodiloma (top-shells)

Choriplax (chitons)

Chromodoris (sea-slugs)

Cingulina (pyramid-shells)

Circomphalus (venuses)

Circulus (glass-shells)

Cirsonella (false-top-shells)

Cirsotrema (wentletraps)

Clanculus (top-shells)

Cleidothaerus (rock-clams)

Clio (sea-butterflies)

Cocculinella (cap-limpets)

Codakia (lucines)

Colpodaspis (bubble-shells)

Colpospira (screw-shells)

Cominella (whelks)

Conassiminea (assimineas)

Condylocardia (condyl-clams)

Condylocuna (condyl-clams)

Conus (cones)

Coralliophila (coral-snails)

Corambe (sea-slugs)

Cosa (cosas)

Cosmetalepas (keyhole-limpets)

Coxiella (coxiellas)

Cranchia (squids)

Craspedochiton (chitons)

Crassispira (turrids)

Crassitoniella (eaton-shells)

Crassostrea (oysters)

Creseis (sea-butterflies)

Crimora (sea-slugs)

Crossea (false-top-shells)

Cryptassiminea (assimineas)

Cryptoplax (fleshy-chitons)

Ctenopteryx (squids)

Cumia (whelks)

Cuna (condyl-clams)

Cunanax (condyl-clams)

Cupidoliva (olives)

Curveulima (urchin-snails)

Cuspidaria (spoon-shells)

Cyamiomactra (bean-shells)

Cyclocardia (false-cockles)

Cyclochlamys (scallops)

Cyclopecten (scallops)

Cyclostrema (false-top-shells)

Cyclotellina (tellins)

Cylichna (peanut-shells)

Cylichnatys (bubble-shells)

Cymatium (rock-whelks)

Cystiscus (margin-shells)