- Clelandella miliaris
- Cochlodesma praetenue
- Colpodaspis pusillus
- Colus gracilis
- Colus islandicus
- Colus jeffreysianus
- Comarmondia gracilis
- Corambe obscura
- Corbula gibba
- Coryphella browni
- Coryphella gracilis
- Coryphella lineata
- Coryphella pedata
- Coryphella pellucida
- Coryphella verrucosa
- Crassadoma pusio
- Crassostrea gigas
- Crassostrea virginica
- Crenella decussata
- Crepidula fornicata
- Crisilla semistriata
- Cuspidaria cuspidata
- Cuspidaria obesa
- Cuspidaria rostrata
- Cuthona amoena
- Cuthona caerulea
- Cuthona concinna
- Cuthona foliata
- Cuthona gymnota
- Cuthona nana
- Cuthona pustulata
- Cuthona rubescens
- Cuthona viridis
- Cylichna cylindracea
- Dendronotus frondosus
- Dentalium entalis
- Dentalium vulgare
- Devonia perrieri
- Diaphana minuta
- Dikoleps pusilla
- Diodora graeca
- Diplodonta rotundata
- Donax vittatus
- Dosinia exoleta
- Dosinia lupina
- Doto coronata
- Doto cuspidata
- Doto dunnei
- Doto fragilis
- Doto millbayana