746 CRETACEOUS PALEONTOLOGY. 



Description. — "Shell small or somewhat below a medium size, 

 very ventricose, with a very low spire composed of but little more 

 than two entire volutions in the cast ; outer volution large, form- 

 ing the great bulk of the shell and having a diameter considerably 

 greater than the entire height, including the short beak and canal. 

 Volutions marked on the periphery by a flattened, vertical band, 

 bordered above and below by an angulation ; a second angulation 

 also marking the upper surface midway between the top of the 

 vertical flattening and the suture line, and still another on the 

 under side of the volution near the base of the beak ; columellar 

 cavity only of medium size, with aperture large, wider or about 

 as wide as high, but little modified on the inner side by the preced- 

 ing volution; lip slightly expanded; surface unknown." (Whit- 

 field.) 



Remarks. — The flattened bands upon the body of the shell of 

 this species somewhat r&stwAA^ Perissolax trivolva (Gabb), of the 

 Vincentown limesand, but it has a much lower spire of fewer 

 volutions, and it lacks the long anterior canal of that species. 

 The species has not been certainly met with in the recent collec- 

 tions of the Survey. The species should possibly not be separated 

 from P. septeinlirata. 



Poiinatioii and locality.. — Navesink marl, Crosswicks Creek 

 (Whitfield). 



Geographic distribution. — New Jersey. 



Pyropsis trochiformis (Tuomey). 

 Plate LXXXVIL, Figs. i-il. 



1854. Pyrnla trochiformis Tuomey, Proc. Acad. Nat. Sci. Phil., 



vol. 7, p. 169. 

 1861. Tiidicla (Pyropsis) trochiforuiis Gahh, Synop. Moll. Cret. 



Form., p. 141 (85). 

 1864. Ttvdicla trochiformis Meek, Check List Inv. Foss. N. A., 



Cret. and Jur., p. 22. 

 1876. ? Pyropsis trochiformis Gabb, Proc. Acad. Nat. Sci. Phil. 



(1876), p. 285. 

 1892. Pyropsis Richardsonii ? Whitf., Pal. N. J., vol. 2 



(Monog. U. S. G. S., vol. 18), p. 39, pi. i, figs. 14-16. 



( Not P richardsoni Tuomey. ) 



