Jacksonian auger (Terebra jacksoniana)
Jackson’s rice-shell (Amphithalamus jacksoni)
Jan Juc false rice-shell (Microdryas janjucensis)
Jan Juc sea-slug (Polycera janjukia)
jewel-bearing sinistral-creeper (Teretriphora gemmegens)
jewelled top-shell (Astele armillatum)
Johnston’s false-top-shell (Liotella johnstoni)
Johnston’s margin-shell (Austroginella johnstoni)
Joseph’s top-shell (Charisma josephi)
Joshuan urchin-snail (Eulima joshuana)
juicy chiton (Rhyssoplax jugosa)
Jukes’ wentletrap (Epitonium jukesianum)
Julian sea-hare (Aplysia juliana)
Julia’s sea-lemon (Aphelodoris juliae)