794 CRETACEOUS PAEEONTOLOGY. 



point the surface is gently convex to a point about two-thirds 

 the distance from the suture to the anterior margin, below which 

 it contracts rather abruptly to the umbilical margin; the shell 

 is not produced into an anterior canal. In the casts the umbilical 

 cavity is narrow, indicating an imperforate or a very narrowly 

 perforate shell, columella marked by three faint revolving folds 

 situated below the middle of the inner lip of the aperture. Sur- 

 face of the shell as seen in impressions of the exterior, marked 

 by rather strong, regular transverse ribs which curve backward 

 from the suture until they cross the somewhat rounded shoulder 

 of the shell, below which they are nearly vertical; about 20 to 

 22 of these ribs occupy the larger volutions, but they do not 

 cross the lower contracted portion of the outer volution; surface 

 also marked by narrow, raised, revolving lines, six or eight of 

 which occupy the nearly vertical surface of the outer volution 

 and the volutions of the spire, with the vertical ribs dividing that 

 surface of the shell into depressed, quadrangular spaces; about 

 six similar revolving lines are also present upon the lower con- 

 tracting portion of the outer volution, continuing to the um- 

 bilical margin, all the revolving lines exhibit some tendency to 

 alternate in size. 



Remarks. — This species differs from C. subalta, with which it 

 is associated, in its much more robust form and in its larger size. 



Porniation and locality. — Merchantville clay-marl, near Mat- 

 awan (loi); Woodbury clay, Lorillard (102), near Matawan 

 (103). 



Geographic distribution.- — New Jersey. 



Genus Turbinopsis Conrad. 



Turbinopsis depressa Gabb. 



Plate XCVIII., Figs. 6-1 1. 



1861. Turbinopsis depressa Gabb, Proc. Acad. Nat. Sci. Phil. 



(1861), p. 321. 

 1864. Turbinopsis depressus Meek, Check Eist Inv. Eoss. N. A., 



Cret. and Jur., p. 19. 



