| CEPHALOPOD | Any marine mollusc of the class that includes the octopus, squid, cuttlefish and nautilus (10) |
| CRUSTACEAN | Any arthropod of the class that includes the crabs, lobsters, shrimp, water fleas etc. (10) |
| BIVALVE | A mollusc of the class Pelecypoda, which includes clams, cockles, oysters and mussels |
| INKSAC | Modified gland found in squid, cuttlefish and octopus (3-3) |
| ESTER | Organic compound of the class that provides the fragrance and flavour of many flowers and fruits, commonly derived from carboxylic acids (5) |
| CONCH | Tropical marine mollusc of the genus Strombus (5) |
| ABALONE | Edible marine mollusc of the genus Haliotis (7) |
| CILIATA | Biological class that includes the paramecium |
| 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) |
| INFORMS | Tells the class that sin, outwardly, is bad (7) |
| CUTTLEFISH | Mollusc of the genus Sepia having a broad flattened body (10) |
| WATERCRAFT | Any marine vessel |
| OYSTER | Any marine bivalve mollusc of the order Ostreida, common in shallow coastal waters (6) |
| WHELK | Any predatory marine gastropod mollusc of the family Buccinidae, having a strong snaillike shell (5) |
| SNAIL | Any spiral-shelled gastropod mollusc of the family Helicidae, especially the common Cornu aspersum (formerly Helix aspersa) (5) |
| TEREDO | Genus of marine bivalve molluscs of the family Teredinidae known as the shipworms (6) |
| BOBTAIL | ___ squid are related to the cuttlefish and also known as dumpling squid (7) |
| WRASSE | Any marine percoid fish of the family Labridae, having thick lips, strong teeth and generally bright coloration (6) |
| SMELT | Any marine or freshwater salmonoid food fish of the family Osmeridae, especially the European Osmerus eperlanus (5) |
| COWRIE | A marine gastropod mollusc of the family Cypraeidae, with a glossy brightly-marked shell with an elongated opening |
