MOLLUSCA. 743 



1905. Pyrifusus pyruloidea Johns., Proc. Acad. Nat. Sci. Phil. 

 (1905), p. 24. 



Description. — Shell turbinate, with a very low spire consisting 

 of little more than three volutions, which increase rapidly in 

 size with the growth O'f the shell, the outer volution comprising 

 the greater bulk of the shell. Aperture very large, subovate in 

 outline except as it is modified on the inner side by the previous 

 volution, widest at the upper third O'f its height and sharply 

 pointed anteriorly. The columellar cavity in the casts propor- 

 tionally broad, with no impressions of revolving folds. The 

 surface of the body volution of the casts marked by rather 

 ■obscure vertical folds on its upper part, seven of which may be 

 counted on the outer half of the volution. The fragment of 

 shell which remains on the specimen is marked by strong, some- 

 what irregular lines oif growth, which are gathered in groups 

 on the upper portion of the volution tO' form the vertical folds 

 which are visible also in the cast. 



Remarks. — ^This species is a rare one and has not been met 

 with in the recent collections of the Survey, being known only 

 from the type specimen. It seems to be a well-marked species 

 and may be recognized by its lO'W spire and large body volution 

 with the greatest diameter high up and the base pointed. The 

 cast resembles in some degree small individuals of P. trochi- 

 formis, but it is more elongate. The type specimen seems to 

 show an indefinite revolving line on the outside of the shell 

 about two-thirds of the distance between the suture and the an- 

 terior extremity, which is also recognizable upon the cast as a 

 faint, impressed band. The characters of this shell are scarcely 

 consistent with those of the genus Pyrifusus where it has been 

 placed by Whitfield, and it is here referred to Pyropsis where it 

 seems to be more properly placed, although this generic refer- 

 ence may be incorrect. 



Formation and locality. — Navesink marl, Burlington County 

 (Gabb). 



Geographic distribution. — New Jersey. 



