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250
MONOMYARIA.—AVICULADÆ.
coast, chiefly in deep water. Montagu found a bed of them in Salcomb Bay, which was occasionally accessible when the tide receded beyond its usual limits. The valves stood upright, with the broader end about an inch above the surface, and the lower end fixed so firmly to the soil by a very large strong byssus two or three inches in length, composed of numerous fine silky fibres of a dark purplish brown hue, as to demand the exercise of considerable force for their removal.
PINNA.
