GASTEROPODA OP THE LOWER GREEN MARLS. 45 



which the genus Pyropsis was originally founded, on account of the exist- 

 ence of a ridge-like featvire on the columella near the base of the aperture, 

 ■ which indicates a projection of the shell at this point and the oblique 

 truncation of the anterior ends of the casts, features which would appear 

 to ally this and the following species with Bapa papijracea Lam., and I 

 strongly suspect that is where they both belong. 



Formation and locality : In the Lower Marls of New Jersey, at MuUica 

 Hill and Holmdel. The specimens are invariably in a very poor state of 

 preservation. 



Pyropsis (Kapa ?) Cokkina, n. sp. 

 Plate III, Figs. 1-3. 



Shell of medium size, turbinate, with a nearly flat spire, consisting of 

 two and a half to three volutions, and with a short base; volutions rounded 

 above, and separated by deep, wide sutures in the casts, increasing very 

 rapidly with the increased growth of the shell, broadly rounded on the 

 periphery and aiigulated at the base, with a projecting border around the 

 extremely wide and open umbilical cavity of the cast; aperture large, 

 obliquely subovate, rounded above and on the outer side, straightened or 

 strongly modified on the inner margin and pointed below; columella strong, 

 or else hollow and formed by a free inner lip like that of Bapa; marked 

 on the lower part by a strong angulation, which has projected into the 

 aperture like a knee a short distance above the base; surface of the cast 

 smooth, showing no evidence of spiral or transverse lines or ridges. 



T at first included this species among those referred to Pyropsis trachy- 

 formis Tuomey, but was compelled subsequently to change its position from 

 the evidence afibrded by the knee-like projecting ridge of the columella, 

 which I think allies this shell, and also P. septemlirata Gabb, with Bapa, 

 deeming them closely allied to shells like B. papyracea Lam. ; but from want 

 of sufficient evidence I leave them in their present place doubtfully. 



Formation and locality: In the Lower Green Marls at Holmdel, New 

 Jersey. From Prof. Reiley's collection. . 



