Perkins.] 150 [November 3, 



CARDIADJ3. 



LuEVIcardium l Swainson, 1840. 



Ij8BVicardium Mortoni. Liocardium Mortoni Stimps., Check 

 List. Cardium Mortoni Conrad, Journ. Acad. Nat. Sc. Phil, Vol. 

 vi, p. 259, pi. x, figs. 5, 6, 7; Gould, Invert. Mass., p. 91; De Kay, 

 Moll. N. Y., p. 207, pi. xxiii, fig. 251. 



Quite common at certain seasons, but usually rather rare. It 

 varies greatly in color, and is usually roughened, as if weathered, on 

 the outside. Animal white; mantle open, edge somewhat ruffled; 

 gills two pair, inner much larger than outer; foot large and long, 

 when contracted it is folded back upon itself; palpi not long, narrow; 

 siphon tube merely a circular opening in the mantle surrounded by 

 numerous short papillae. 



Cabdium Linne, 1758. 



Cardium pinnulatum Conrad; Gould, Invert. Mass., p. 90, fig. 

 57; De Kay, Moll. N. Y., p. 205, pi. xxii, fig. 249. 



Very rare, collected near the entrance of the harbor by Professor 

 Verrill. 



ASTARmm 



Astarte Sowerby, 1816. 



Astarte lutea 2 nobis. 



Shell gibbous, thick, inequilateral, subtrigonal, length and breadth 

 nearly equal, surface curving regularly from the umbones to the op- 

 posite edge, highest just above the middle; beaks prominent, much 

 incurved, not meeting; lunule deep, heart-shaped; surface undulated 

 by twenty or more large, elevated ridges, which are concentric, 

 nearly equidistant, the sulcations between nearly as broad as the 

 ridges, which are highest and sharpest on the upper half of the shell, 

 becoming finer, but not disappearing at the ends, in the lunule being 

 merely coarse stria? ; anterior slope incurved ; posterior slope slightly 

 curved; margin distinctly crenulated within; teeth stout, summits 

 somewhat rounded ; in the right valve one cardinal tooth with a deep 



1 Often, but incorrectly, written Liocardium. The name is from Icsvis and 

 cardium. 



2 Lutaus, orange colored. 



