GASTEROPODA OF THE LOWER GREEN MARLS. 35 



Pyropsis elevata. 

 Plate I, Figs. 11-13. 



Rapa elevata Gabb : Jour. Acad. Nat. Sci., Phila., 2d ser., vol. 4, p. 301, 

 PL XLViii, Fig. 12, Meek, Geol. N. J., Newark, 1868, p. 730. 



Tudicla elevata Gabb: Synopsis, pp. 74-85; Meek, Check List Cret. and Jur. Foss., 

 p. 23; Geol. N. J , Newark, 1868, p. 730. 



Pyropsis perlata Conrad; Am. Jour. Conch., vol. 4, p. 248. 



Pyrula Richardsonii (Tuomey) Conrad: ibid. 



Pyropsis elevata Gabb: Proc. Acad. Nat. Sci., Phila., 1876, p. 284. 



Shell rather large, broadly turbinate, with a very low spire, in which 

 the volutions scarcely rise above each other beyond the general slope of the 

 upper surface of the outer one; whorls about three in number, the outer 

 one large and biangular in the upper part, the upper surface sloping from 

 the suture to the periphery, forming only a very slight angle with the axis of 

 the shell on all the inner parts, but more rapidly declining on the outer part 

 of the last one; periphery of the last volution nearly vertical between the 

 upper and lower angles, but very rapidly contracted in the lower part to 

 form the short, obtuse, anterior canal; aperture very large, fully four-fifths 

 of the entire height of the shell, strongly biangular on the outer side, and 

 modified on the upper inner portion by the body of the preceding volution; 

 axis as shown on the cast, large, destitute of columellar folds; surface of 

 the shell seemingly marked by revolving ridges, but not very deeply, as 

 the cast shows only very faint traces of them, scarcely sufficient to afford 

 grounds for a positive assertion that they really existed, yet pretty positive 

 indications of lines of growth exist on the summit of the outer volution, 

 and also of stronger folds or varices at somewhat regular distances, prob- 

 ably indicating six or eight on the last whorl. 



There may be some question as to the identity of this species with 

 Conrad's Pyropsis perlata. This matter has been discussed by Messrs. 

 Gabb and Conrad' without any very satisfactory results. There cer- 

 tainly is a great resemblance -between the type specimen of this species 

 and the cast which I have referred doubtfully to Mr. Conrad's species; but 

 I am not so sure of its identity with the shell originally figured by Conrad 



' Am, Jonr. Conch., vol. 4, p. 428, aud Proc. Acad. Nat. Sci., Phila., 1876, p. 284. 



