in Medicine, the same with ACHOR.

CRUSTACEOUS fish, in Natural History, are those covered with shells, consisting of several pieces or scales; as those of crabs, lobsters, &c.

These are usually softer than the shells of the testaceous kind, which consist of a single piece, and generally much thicker and stronger than the former; such as those of the oyster, scallop, cockle, &c.

Dr Woodward observes, in his Natural History, that of all the shells found in beds of all the different matters dug out of the earth, there are scarce any of the crustaceous kind: the reason he gives for it is, that these being much lighter than the rest, must have floated on the surface at the time of the deluge, when all the flints were formed; and there have corrupted and perished.