106 PALEONTOLOGY OF NEW JERSEY. 
one-fourth of an inch to five-sixteenths of an inch in length, and are pro- 
portionally much more slender than are those of that species. They also 
possess a greater number of vertical lines, and two additional spiral lines 
on the body whorl. The surface features are much like those of that 
species, but on many of them the spiral lines are more distinctly raised ribs, 
and the line of nodes below the suture more distinctly separated from and 
proportionally larger than those below. The thickened outer lip is the same 
as on that shell, as also is the lip-like varix within the limit of the body 
whorl, but the teeth-like ridges on the columella and on the inside of the 
outer lip appear on most specimens somewhat stronger in proportion to the 
size of the shell, while the proportional length of the spire, as compared to 
that of the body whorl, is considerably greater. These features are so marked 
as to render it unsafe to include these specimens under the same specific 
head with 7. trivittatoides. 
Formation and locality: In the gray Miocene marls, at Shiloh and 
Jericho, N. J. From the collection of the National Museum. 
TRITIA BIDENTATA. 
1G S004 1s Tf 
Buccinum bidentatum Emmons: N. Car. Geol. Surv., 1858, p. 257, fig. 126. 
Tritia bidentata Conrad: Proc. Acad. Nat. Sci. Phila., 1862, p.562. Meek, Check List 
Miocene Foss., p. 20. 
‘Shell quite small, thick, robust; whorls about five, two upper smooth, 
the others are ornamented with ribs and spiral bands; aperture oval, acute 
behind, outer lip furnished with two rather prominent teeth or short ridges; 
canal wide and very short.” (Emmons.) 
This shell differs from the two others of this type occurring with it 
in its size and proportions, this one being shorter and more robust than 
either of the others, the volutions more inflated and ventricose and often 
six in number, and the teeth in the aperture several. As compared 
with 7. trivittatoides, the size alone is quite sufficient to distinguish it, 
but when compared with the elongated variety, which is more nearly like 
this in size, the rotundity of the volutions and its short broad form needs 
examination. In this one the longitudinal folds are stronger and rounder, 
