New Species of Fossils from Hudson River Group 29 



Beelerophox cixcixxatiexsis, n. sp. 



Plate 1, Fig. 23, dorsal view of a specimen preserving some of 

 the surface omame?itatio?i of the shell ; Fig. 24., ventral view 

 of the same specimen. 



Shell of medium size, subrhomboidal in outline, rather than 

 globular, with the lip laterally expanded. Umbilicus closed, 

 by a callus of the lip, on each side. The aperture is expanded, 

 but, as our specimens are all defective at this place, the extent 

 of the expansion can not be accurately ascertained ; from the 

 curving over of the callus of the lip, however, and other parts 

 preserved, it is evidently as wide and probably wider than the 

 antero-posterior diameter. The dorsum of the outer volution 

 bears a sharp angular keel or band, which becomes more and 

 more prominent toward the aperture. Surface of the shell 

 ornamented with rather coarse, transverse lines, on each side 

 of the keel, that curve forward from the keel and then back- 

 ward toward the umbilical region, where they become obso- 

 lete. This ornamentation probably represents concentric 

 lines of growth and indicates the depth of the notch at the 

 anterior margin of the dorsum, as well as the expansion of 

 the aperture. 



This species is not so closely coiled as B. bilobatns, has a 

 marked, curving callus to the lip, which that species does not 

 possess, beside being distinguished by its keel and concentric 

 or sigmoidal ornamentation or lines of growth. It occurs in 

 the Hudson River Group, at the quarries in Cincinnati, but is 

 rare and generally poorly preserved. The specimen illus- 

 trated is from the collection of Mr. C. L. Faber. 



Cvpricardites hainesi, S. A. Miller. 



Ischyrodonta, Ulrich, is manifestly a synonym for Cypri- 

 cardites, and Ischyrodonta truncdta, the type of the genus, we 

 think, may readily be shown to be a synonym for Cypricardites 

 hainesi. Mr. Ulrich says, in his definition, that he had seen 



