84 PALEONTOLOGY OF NEW JERSEY. 
Genus RANGIA Desmoulins. 
RANGIA (PERISSODON) MINOR? 
Plate xv, figs. 4-6. ‘ 
Gnathodon minor Conrad: Am. Jour. Sei., vol. 41, Ist ser., p. 60, Pl. mu, fig. 14; 
Miocene Foss., p. 69, Pl. XXx1x, fig. 6; Tuomey and Holmes, Plioe. Foss. 8S. C., 
p: 99; Pl. xximy fig-*2: 
Rangia minor Conrad: Proc. Acad. Nat. Sci. Phila., 1862, p. 573. 
Rangia (Perissodon\ minor (Conrad), Meek: Check List Miocene Foss., p. 11. 
‘“Subtriangular, convex-depressed, inequilateral; posterior extremity 
truncated and nearly direct; umbonal slope angulated. 
“The hinge resembles that of MZ. [G@.] grayi. The shell is proportionally 
shorter and less ventricose, and is distinguished by the more direct posterior 
margin.” (Conrad, in Miocene Fossils.) 
I have seen but a single valve (right) that I can refer to this species, 
and I am in considerable doubt in regard to that one. The form of the 
shell closely resembles Mr. Conrad’s figure, both in outline and convexity, 
as in size; but as he has not figured the interior, and as I have not seen the 
type, I can only judge of its internal features by the statement: that it 
resembles Gnathodon Gray: in this respect, which it doesonly very distantly. 
The specimen is of a triangular or triangularly ovate form, moderately con- 
vex, umbonal angle distinct, and the slope abrupt. The posterior end is 
slightly arcuate and the anterior rounded. Surface smooth and semipolished. 
In the interior the hinge has a single thin and almost sharp central tooth, 
with a small pit on each side. On the anterior side a moderately well- 
developed lateral tooth is distinctly shown, with two supplementary teeth, 
and also a supplementary tooth on the posterior side. These are exceed- 
ingly thin and small, and the doubling of the one on the anterior side may 
be an accidental feature. The muscular imprints are small but distinct and 
the pallial sinus is wide and shallow. The shell is not a’true Mactra, neither 
is it a true Rangia, but it differs too much from the hinge features of Con- 
rad’s type of Perissodon, Gnathodon Grayi (= G. clathrodonta), to render it 
entirely safe to place it in that genus. So I have placed it under Rangia 
provisionally. 
Locality: The specimen used is from Shiloh, N. J., and belongs to the 
National Museum collection. 
