MIOCEKE MOLLUSCA AND CRUSTACEA. 53 



form, acutely rounded at the extremity ; cardinal teeth long and rather slen- 

 der; margin crenulated. 



u This species approaches the A. perplana, but is proportionally much 

 longer, and the lunule much more profound." 



Among the specimens from the well-borings at Atlantic City, there are 

 the apical parts of two single valves which I take to belong to the above 

 species. From these fragments alone it is difficult to determine between 

 this and Astarte obruta, but in this species the umbones are said to be flat, 

 while in A. obruta they ought to be prominent. On these fragments they 

 are flat and the edges of the valves are sharp, and the lunule very deep and 

 short. Owing to these features alone I have concluded that the fragments 

 belong to A. cuneiformis rather than to A. obruta. 



Formation and locality : From the well-borings of Mr. Woolman, at Atlan- 

 tic City, N. J. The specimens belong to the Academy of Natural Sciences, 

 Philadelphia. 



Astarte distans. 



Plate vn, figs. 13-17. 



Astarte distans Conrad: Proc. Acad. Nat. Sci., Phil., 1862, p. 288 and p. 578; Am. Jour. 

 Conch., vol. 2, p. 72, PI. iv, fig. 14; Meek, Check List Miocene Foss., p. 7; Heil- 

 prin, Miocene Moll, of New Jersey, Proc. Acad. Nat. Sci., 1887, pp. 397, 398, 

 and 402. 



Astarte undulata Heilprin : Cont. to the Tert. Geol. and Pal. of the U. S., p. 8. 



" Triangular, convex-depressed, with four broad, concentric undula- 

 tions; concentric lines unequal; umbo flattened, with prominent, small, con- 

 centric ribs; inner margin minutely crenulated." (Conrad in American 

 Journal of Conchology, vol. 2, p. 72.) 



This shell is of medium size, triangular in outline, slightly inequilateral, 

 the posterior end being generally a little the longest; disk of the valves very 

 compressed convex and marked by a few strong, distant, concentric undu- 

 lations, with finer concentric lines on and between them. Near the beak 

 the concentric undulations are close and crowded, five or six in number; 

 but on the body of the shell there are three or four broad and strong folds. 

 On the larger shells the space near the margin is often nearly plain, or 

 marked only by the finer lines. Lunule and escutcheon narrow and abrupt, 



