Bivalve, consisting of two valves or divisions.
Blotched, spotted in an irregular way.
Blunt, obtuse, opposed to acute.
Borer, a piercer.
Brinded, streaked.
Bulging, gibbous, swollen out.
Bullate, of a blistered appearance.
Byssus, a beard, common in the Mytilus and Pinna.
C.
Calcareous, relating to lime, of a limy nature.