60 ‘PALEONTOLOGY OF NEW JERSEY. 
TRACHYTRITON ? HOLMDELENSE, 0. sp. 
Plate v, Figs. 16, 17. 
Shell of medium size; spire moderately elevated, having an apical 
angle of 50° or over; is composed of about five very rotund volutions, and 
forms fully two-thirds of the entire length of the cast when viewed from the 
back of the specimen; below the point of greatest diameter the cast is short 
and the beak only slightly extended beyond the general rotundity of the 
body volution; suture lines between the volutions in the cast clear, distinct, 
and deep; aperture rather broadly elliptical; rounded above; slightly 
pointed below and straightened on the inner side below the middle of its 
height; columella moderately strong and smooth; surface of the cast marked 
by vertical folds, thirteen or fourteen to the volution; these folds distinetly 
bend backward in the middle in crossing the whorl, and are again directed 
forward below, forming a broad sinuosity in crossing the whorl; no evidence | 
of revolving lines discernible on any of the specimens. 
This species may not properly belong to the genus Trachytriton. It is 
shorter below the point of greatest diameter of the body volution than 
any speciés of that genus with which I am acquainted, and the varices have 
not quite the character required, as they are all of similar form and size, 
and more sinuate than they ought to be under the genus. The beak has 
been short and there is no evidence of spiral lines or ridges. It has a more 
obtuse spire than any of the other New Jersey species of this genus, with 
rounder volution and deeper sutures. It has much the appearance of Cryp- 
torhytes flevicostata M. & H.,‘ but the beak has been even shorter than in that 
one, and the shell less slender, while the columella affords no evidence what- 
ever of any folds or plica of any kind. Its generic relations are quite uncer- 
tain, and I shall leave it under Trachytriton provisionally. 
Formation and locality: In the Lower Marl Beds at Holmdel, New 
Jersey. Collection at Rutgers College. 
1U. S. Geol. Sur. Terr., vol. 9, Invert. Pal., p. 367, Pl. x1x, Fig. 2. 
