NATURAL SCIENCES OF PHILADELPHIA. 133 



in occidenfalis the larger ribs are comparatively few and distant, 

 ■with three or four smaller ribs between each pair." 



Area transversa, Say. 



"I find some small specimens that I think are this species, but 

 am uncertain whether they are not the young of some of the 

 others, especially as Stimpson does not include it in his Beaufort 

 list. Kurtz, however, gives it from both N. and S. C." I should 

 add, that Prof. Stimpson, in looking over an early lot of shells I 

 sent to the Smithsonian, made the same identification, presumably 

 from the same specimens that Mr. Smith subsequently received. 



Area limula, Conr. 



Beach, frequent. The specimens were without exception grayish 

 or rust-colored, with a chalky appearance in places. 



" Fossil ? Conrad quotes it as a miocene fossil from the Xeuse 

 River, below New Berne, and from Wilmington, N. C. It agrees 

 perfectly with Conrad's description and figure (Mioc. Foss. U. S., 

 p. 60, pi. 31, fig. 3)." 

 Area ponderosa, Say. 



Beach; fresh or living specimens, common. 



Area incongrua, Say. 



Beach; the most abundant of the genus, apparently; and, with 

 the last, oftenest found alive. 



Area. 



" Numerous specimens, all I think fossil ; and I have not the 

 means of determining them." 

 Nucula proxima, Say. 



Dredged, in the channels. 

 Yoldia limatula, Say. 



Beach, occasional, and dredged. 



Leda acuta, Conr. 



In the sand, frequent. Bird Shoals. 



Finna seminuda of Kurtz's list. 



Abundant. There may have been another species among the 

 many specimens gathered, only a few of which were forwarded. 



Avicula atlantica, Lam. 



Not common ; only two specimens secured. 

 187 l.J 



