94 JOURNAL OF THE NEW JERSEY 



hinge margin strong ; 2 large cardinal teeth in the left, and 1 

 in the right valve. Epidermis brownish olive ; interior polished, 

 bluish-white. L. 30 ; H. 27 ; W. 14 ; U. about central ; An 120°. 

 — New England. Dead shells common. 



2. Astarte castanea, Say. Similar in form and solidity to A. 

 undata; but the umbones are more elevated, the lunule'is short, 

 broad, deep, smooth, ovate lanceolate ; surface very slightly un- 

 dulated at the stages of growth ; ligament small ; interior margin, 

 like A. undata, is crenulated in adult shells. Epidermis chestnut 

 color, with usually, the posterior portion curiously blackened. 

 L. 25 ; H. 25 ; W. 13 ; U. about central ; An. 110°.— New Jersey 

 and north. Common. 



Family 10. CRASSATELLID/E. 



Shell rounded to oblong, mostly concentrically striated or fur- 

 rowed, covered with an epidermis ; hinge with about 2 teeth in 

 each valve ; jjallial line entire or with a sinus. 

 1. Eriphyla, Gabb. 



Shell equivalve, somewhat triangular, with concentric ridges 

 or plates ; lunule distinct, cardinal teeth 1-2 ; pallial line about 

 simple. 



1. Eriphyla lunulata, Con. Shell small, solid, orbicular, with 

 the anterior slope truncated obliquely, or slightly concave, mak- 

 ing it quadrant shaped ; lunule long and deeply excavated ; the 

 surface is undulated, with about 14, concentric, rib-like waves, 

 and is marked between them with minute, regular radiating 

 stride. Color pale yellowish-green. L. 6 ; H. 6 ; W. 2^ ; U. J , 

 An. 90°. — Cape Cod and south. Common. 

 Family 11. ERYCINID/E. 



Shells vf ry small, thin, fragile, usually transparent, and some- 

 times gaping ; hinge narrow, with one or two cardinal teeth ; 

 muscular impressions small and faint; pallial line entire. 



* Shell very minute, less than 3 long, translucent ; nearly twice as long as 

 high 1. Turtonia. 



* Shell over 3 long, compressed 2. Kellia. 



1. Turtonia, For. & Han. 



Shell oblong, with umbones near anterior end ; ligament con- 

 cealed between the valves ; cardinal teeth 2 in each valve. 



Animal with only the excurrent siphon w^hich is slender and 

 elongated. 



