MOLLUSCA. 725 



Family TBITONIDAB. 

 Genus TRITON Montfort. 



Triton lorillardensis n. sp. 

 Plate LXXXIV., Figs. 5-6. 



Description. The dimensions of the type specimen, with 

 some restoration, are: height, 25 mm.; height of spire, 14 mm; 

 greatest diameter, 15 mm.; apical angle, about 40. Shell with 

 probably five or six volutions, the suture well defined, the outer 

 volution produced below into a very short anterior canal. Sur- 

 face of the volutions of the spire convex from suture to suture, 

 the curvature a little flattened above, with about 12 strong 

 subangular vertical nodes or varices upon each volution, which 

 extend from suture to suture and are separated by broad con- 

 cave areas. Upon the outer volution the varices become obso- 

 lete below, and the surface becomes concave as it passes into the 

 short anterior canal. Aperture subovate in outline, somewhat 

 oblique, pointed below, about twice as high as wide; at the lower 

 extremity of the columellar lip in the cast three notches can be 

 detected which seem to indicate the presence o<f three some- 

 what obscure revolving columellar folds; the outer lip is marked 

 by revolving ribs internally. The surface of the shell is marked 

 by revolving costse about one millimeter apart, with the spaces 

 between filled with exceedingly fine revolving lines; the entire 

 surface is also marked with exceedingly fine transverse lines of 

 growth. 



Remarks. The type of this species consists of an incomplete 

 internal cast which has been restored to its normal form so far as 

 possible, and a partial impression of the exterior, which has 

 furnished the character of the finer surface markings. Upon the 

 casts the vertical nodes are well shown, but are broader and 

 rounder than on the shell itself, and the stronger revolving costae 

 are present towards the aperture. 



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



Geographic distribution. New Jersey. 



