TIIju ECONOMIC MOLLUSCA OP ACADIA. 
93 
North Atlantic to Northern Europe, Great Britain and 
Portugal. 
(£) In Acadia ; — (in N, B.) Grand Manan, rarely found, 
Stimpson. Bay of Fundy, six to ninety fathoms, Verrill • 
Passamaquoddy Bay, Ganong. Northumberland Straits, 
Whiteaves. (In N. S.) Halifax Harbor, common, Jones. 
Annapolis Basin, St. Mary’s Bay, not abundant, VerTcruzen. 
(In P. E. I.) Not specially reported, but doubtless occurs. 
Probably to be found on mud and sand bottoms all around 
the coast. 
Habits. This is one of the two or three Molluscs popularly 
included under the name Quahog — Venus mercenaria being the true 
Quahog. In general appearance these two shells are much alike, their 
FlG. 16. — Cyprina Islandica . Natural Size. 
shape, especially, being very similar. But they may always be distin. 
guished by their color, which, in the latter, is ashy or chalky-white, 
while in the former, if the epidermis is present (as it nearly always is) 
it is a dark burnt-brown, or nearly black color. This species wants the 
purple color of the interior of V. mercenaria, and differs from it also in 
