MOLLUSCA. 759 



The dimensions given are of the largest individual observed, but 

 numerous smaller specimens have been collected. 



Formation and locality. Woodbury clay, Lorillard (102). 



Geographic distribution. New Jersey. 



Genus CRYPTORHYTIS Meek. 



Cryptorhytis obliquicostata Gabb. 

 Plate LXXXIX., Fig. 8. 



1876. Fasciolaria (Cryptorhytis) obliquicostata' Gabb, Proc. 

 Acad. Nat. Sci. Phil. (1876). p. 283. 



Description. The approximate dimensions of an imperfect 

 specimen are: height of shell when complete, point of spire re- 

 stored, 12.5 mm.; height of spire, about 4 mm.; greatest diam- 

 eter, 7 mm.; apical angle, about 52. Shell fusiform with about 

 three or four volutions, suture well defined, outer volution pro- 

 duced below into a rather short anterior canal. Surface of the 

 volutions of the spire convex from suture to suture, and marked 

 by a series of elongate, slightly oblique, rather sharp nodes, about 

 ii or 12 on each volution, which originate close to the upper su- 

 ture, become strongest at about the mid-height of the volution 

 and grow fainter below to the lower suture. Upon the outer volu- 

 tion the nodes resemble those> of the spire and become obsolete 

 below, about half way between the suture and the extremity of 

 the anterior canal ; the surface of the outer volution is convex from 

 the suture to below the middle where it becomes concave as it 

 passes into the anterior canal, the periphery being without a dis- 

 tinct angulation. Surface of the shell marked throughout with 

 fine revolving lines. 



Remarks. This species is represented in the collections from 

 New Jersey by very few imperfect examples in which the most 

 essential characters are not shown. These examples have been 

 compared with the type of the species, however, and the two seem 

 to agree in such characters as are shown on both specimens, and 

 the identification is probably correct. 



