MIOCENE MOLLUSCA AKD CEUSTACEA. 5B 



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

 der; margin creuulated. 



^" This species approaches the A. perpJana, h\\\ 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 detemiine between 

 this and Asfarfc i>hnit(t, but in this species the umbones are said to be flat, 

 while in A. obnifa they ought t(^ be prominent. On these fragments they 

 are Hat and the edges of the valves are sharp, and the limule very deep and 

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

 lielong to A. cmieiforwis rather than to A. ohruta. 



Formafioii (iikJ hicti/if;/ : From the well-borings of ]\Ir. Woolman, at Atlan- 

 tic City, N. J. 'I'he sjjecimens belong to the Academy of Natural Sciences, 

 Philadelphia. 



ASTAKTE DISTANS. 



l^Iate vii, figs. 13-17. • 



Astfirte distans Conrad : Proc. Acad. Nat. Sci., Pliil., 1862, p. 28S and p. 578; Am. Jour. 

 Couch., vol. 2, p. 72, PI. iv, flg. 14; Meek, Check List ]Mio(^ene Foss., p. 7; Hell- 

 prin, Mioceue ^[oll. of New Jersey, Proc. Acad. Nat. Sci., 1887, pp. .3!t7, 398, 

 and 4112. 



Astarte louhihita Heilpriii : Cout. to the Tert. Geol. aud Pal. of the l^. S., ji. 8. 



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

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

 centric ribs; inner margin minutely creuulated." (Com'ad 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. 



