110 
*M.Pei.ucivws. Pen. 4. p. 237. t. 66.f. 3.—Mont. 
p. 160.—Don. 3. t. 81.—Lin. T. p. 167.— D. p. 310. 
—Turt. D. p. 110.—Ch. f. 751.—Var Envuuis. F. 
p. 411.—Oval, transparent, usually yellowish with dark 
blue rays, broader than the last, anteriorly straight; 
only two or three tubercular teeth under the hinge. 2, 
Common. 
+ My. Srrratuuus. Lin. Mant. p. 548.—Schret. 
Kin. t. 9. f. 16.—Gmel, 3358.—Turt. on Mag. N. H. 
7.—Semitransparent, dark horn-colored, with a few 
paler zones, marked with numerous slight longitudinal 
ribs decussated by transverse depressed lines giving 
them a granulated appearance; front margin a little 
incurved, hinge margin angular. Scarborough. 
* The Crenatus and Ungulatus are occasionly found 
on our coast but are not native species. 
+ Contrary to my usual habit, I have copied the 
synomyms without verifying them, since I am unable 
to procure the described shell. In almost every other 
case reliance may be placed on the foreign synonyms, 
as much labor has been expended in the comparison of 
figures. 
