| CEPHALOPOD | Class of mollusc such as an octopus, squid, cuttlefish or nautilus (10) |
| VALVE | Either of the two hinged parts of the shell of a mollusc such as an oyster, mussel etc. (5) |
| BEAK | A bird's rhamphotheca-covered bill; an octopus, squid or turtle's rostrum; a teacher at Eton; one's nose; or, a bucket's pouring lip (4) |
| GASTROPOD | To what class of mollusc do slugs, snails, cowries and whelks belong? (9) |
| INKSAC | Modified gland found in squid, cuttlefish and octopus (3-3) |
| INK | Cuttlefish or squid's dark defence; or, a pigmented liquid synonymous with written publicity or tattoos (3) |
| MOLLUSC | Cuttlefish or octopus (7) |
| SEPIA | A cuttlefish or its "ink" (5) |
| HERMITCRAB | Nd Which soft-bodied crustacean lives in the empty shells of other molluscs such as whelks? (6,4) |
| CONCHOLOGY | What is the study and collection of mollusc shells? (10) |
| CUTTLEFISH | Chisel tuft out of mollusc |
| MALACOLOGY | (Zoology) The study of molluscs (10) |
| SHELL | Exoskeleton of a mollusc such as cowrie, studied in conchology and formerly used as money (5) |
| SEASNAIL | Gastropod mollusc such as a whelk or abalone (3, 5) |
| CEPHALOPODS | Marine molluscs such as octopuses, squid and cuttlefish (11) |
| GASTEROPODA | Class of molluscs (including snails) (variant) |
| MUSSEL | Marine bivalve mollusc such as the edible Blue ___ (6) |
| WHELK | Marine gastropod mollusc such as the waved ..., Buccinum undatum (5) |
| TEREDO | A bivalve mollusc such as the shipworm (6) |
| RAZORCLAM | A sand-burrowing bivalve mollusc such as Siliqua patula (5,4) |
