Caribbean reef octopus 
Caribbean reef squid 
Caribbean Two-spot Octopus 
Carlsonhoff's Phyllidia 
Carminodoris estrelyado 
Carolina mantleslug 
Cart-Rut Shell 
Carthusian Snail 
Cerastoma tenue 
Ceratosoma amoenum 
Ceratosoma gracillimum 
Cerberilla ambonensis 
Chambered nautilus 
Changeable Mantleslug 
Channeled applesnail 
Checkered Nerite 
Checkered Periwinkle 
Chestnut Slug 
Chinese mystery snail 
Chiton olivaceus 
Chloraea intorta 
Chocolate banded cowry 
Chocolate Spotted Auger 
Chocolate-band Snail