Assertion: whelk's shell | /r/HasProperty | two hinged shells
Facets:
Source sentences:
text: Gastropoda: one coiled shell or reduced/no shell, such as snails and slugs; Pelecypoda or bivalvia: two hinged shells, such as clams and oysters; Scaphopoda: tusk shell; Monoplacophora: chiton; and Cephalopoda: reduced/no shell, such as squid, octopus and cuttlefish.