188 



laceous, opaque, inequilateral ; rounded anteriorly, elongated and 

 truncated posteriorly ; beaks prominent, umbonial region tumid, 

 compressed posteriorly ; epidermis thin, wrinkled, of a rusty brown 

 color, with raised lines of a darker color radiating from the beak. 

 Width, 3-5 inch ; height, 1-3 ; depth, 3-8 inch. Hab. Gulf of 

 St. Lawrence. 



Tellina elucens. Shell sub-oval, thin, white, shining ; incre- 

 mental strise fine and delicate ; inequilateral, short and somewhat 

 pointed behind ; produced, widened and rounded before ; one car- 

 dinal tooth in each valve, lateral teeth obsolete. Width, 2-5 inch ; 

 height, 1-4 ; depth, 1-10 inch. Hab. Casco Bay. 



Mytilus minganensis. Shell oblong-oval ; beaks terminal, 

 slightly curved ; basal and ligament margins equally curved, great- 

 est width nearly central ; rounded anteriorly ; epidermis dark red- 

 dish brown ; deep blue internally ; muscular impressions violet, 

 iridescent. Length, 2 1-4; breadth, 1 3-10 inches. Hab. Gulf 

 of St. Lawrence, at Mingan. 



Bulla incincta. Shell small, cylindrical, opaque, white ; 

 whorls three, the first slightly depressed, the last distinctly girded 

 above the middle ; epidermis yellowish ; spire obtuse, elevated ; 

 suture canaliculate ; aperture narrow behind, wide and rounded 

 before ; right lip sharp, entire, advanced in the central region, 

 with a fissure posteriorly. Length, 3-25; breadth, 3-50 inch. 

 Hab. Casco Bay. 



Cypricardia nodulosa. Shell oblong, very inequilateral, tumid 

 and rounded anteriorly ; produced, compressed and pointed posteri- 

 orly ; beaks elevated, delicately pointed and curved forward ; color a 

 light yellowish brown, with numerous dark colored spots, distributed 

 irregularly ; surface with about eighteen strong, nodulous ribs radia- 

 ting from the beaks ; interior white, with a tinge of purple posteriorly ; 

 two flat, sub-conical cardinal teeth, under and anterior to the beak 

 in the right valve, one tooth, with a groove in the left ; a thin lami- 

 na and pit in each valve behind and near the beaks, with a distinct, 

 elongated, distant lateral tooth in each valve, with alternate, cor- 

 responding grooves. Width, 1-10; height and depth 2-5 inch. 

 Hab. Key West, Florida. 



Cypricardia corrugata. Shell angular, oblong, very inequilat- 

 eral, much inflated, thick and solid; irregularly rounded before; 

 attenuated, produced and obliquely truncated behind; beaks ob- 



