THE ECOXOMIC MOLLUSCA OF ACADIA. 



93 



North Atlantic to Northern Europe, Great Britain and 

 Portugal. 



(b) In Acadia; — (in N. B.) Grand Manan, rarely found, 

 Stimpson. Bay of Fuudy, 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, Verlcruzen. 

 (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 mercmaria being the true 

 Quahog. In general appearance these two shells are muqh alike, their 



Fig. 16. — Cyprma Mandica. 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. mercenarin, and differs from' it also ia. 



