80 



slightly angular and produced anteriorly, with nume- 

 rous regular equidistant rounded transverse ribs 

 becoming obsolete near the side, (especially the an- 

 terior) the interstices smooth and broader than the ribs 

 themselve ; beaks somewhat triangularly prominent, 

 acute and slightly curved ; lunule deep and cordiform, 

 lozenge lanceolate : inside glossy white or cream color ; 

 hinge with two strong teeth in each valve. !...!. 

 W. and Scotch Coasts. 



C. COMPRESSA. VENUS C. Mont. Sup. p. 43. t. 

 26. /. 1. Pen. 4. p. 209. CYPRINA C. Turt. B. p. 

 137. t. 11. /. 21. to 23. ASTARTE C. F.p. 440. 

 V. MONTAGUI. D.p. 167. V. MONTACUTI. Turt. C. 

 D. p. 243. Roundish triangular, a little compressed, 

 strong, thick, flattish, marked with rather distant trans- 

 verse rib-like striae, white or covered with a yellowish 

 brown cuticle; beaks prominent, giving that part a 

 rather triangular outline; lunule elongated, inside 

 white, with the margin flat, thin, and entire, i. 

 Scotland. 



** Margin crenulated. 



C. DANMONIKNSIS. Lam. VENUS SULCATA. Mont, 

 p. 131. Lin. T. S.p. 81. t. 2. f. 2.D. p. 166. 



