732 CRETACEOUS PALEONTOLOGY. 



inner volutions barely rising above the outer ones. Body whorl 

 flattened on the periphery, forming a nearly vertical, flattened 

 band of considerable depth, below which a second obliquely 

 flattened space of somewhat less width occurs, thus forming the 

 three angles on the body of the whorl from which the name was 

 derived. Below the lower angle the surface slopes rapidly to the 

 long, slender canal and beak. Aperture large, angular on the out- 

 side and contracted below at the canal, strongly modified on the 

 inner margin by the preceding volution. Volutions faintly 

 marked by distant varices and along the upper carina by a series 

 of thin, rather closely arranged transverse nodes. No fine sur- 

 face markings or spiral lines are perceptible on any of the speci- 

 mens, all of which are internal casts in a rather coarse yellow 

 limesand." (Whitfield.) 



Remarks. This is a well-marked species, and is one of those 

 designated among the types of the genus Perissolax. Its char- 

 acters are so distinct that it cannot be easily mistaken for any 

 other shell in the Cretaceous faunas of New Jersey. It is known 

 only from internal casts, which are preserved in a matrix which 

 does not well preserve the surface characters of the shell, and the 

 absence of spiral ribs or other marks upon the casts does not 

 signify that they were absent from the shell itself. 



Formation* and locality. Vincentown limesand, Timber Creek 

 (Gabb and Whitfield). 



Geographic distribution. New Jersey. 



Genus PYRIFUSUS Conrad. 

 Pyrifusus meeki Whitfield. 

 Plate LXXXV., Figs. 7-8. 



1892. Pyrifusus meeki Whitf., Pal. N. J., vol. 2 (Monog. U. 

 S. G. $., vol. 18), p. 55, pi. 4, figs. 6-8. 



Description. "Shell moderately large for the genus, having 

 a diameter of nearly i% inches of the body whorl; subequally 

 biconical in general outline; spire elevated, having an apical 



