169 Jaw and Lingual Dentition of Pulmonata. 
Zonites cerinoideus, Anthony. 
* Charleston, S. C., Mr. W. G. Mazyck. 
The animal has the distinct locomotive disk and the parallel furrows 
above the margin of the foot, meeting above a distinct, caudal mucus 
pore, characteristic of the genus. It has also a dart and sac, as in Z. li- 
gerus. 
Jaw as usual in the genus. Lingual membrane (pl. xiii, fig. B), 
as usual in the genus. (See Proc. Phila. Ac. Nat. Sc., 1875, 161). Teeth 
34-1-34 with 9 perfect laterals. ; 
> 
Limax montanus, Ingersoll. 
(Report on Nat Hist. of U. S. Geolog. and Geogr. Survey of the Territories, 
1874, p. 130.) 
This species was found by Mr. Ernest Ingersoll, in the 
mountains of Colorado, at “ camps 9-11, Blue River Val- 
ley,” while attached to the Survey of the Territories, in 1874. 
The animal is about 18-25 mill. long. It presents no peculiar external 
characters. Its color is brown, with mantle, head, tentacles and eye- 
peduncles black: bottom of foot white. On opening the animal I found 
it does not agree in dentition with ZL. campestris, the only native species 
whose presence could be expected there. 
The jaw is as usual in the genus. The lingual membrane is long and 
narrow. ‘Teeth 50-1-—50 (pl. xviii, fig. D), arranged as usual in the 
genus Limax. The central teeth have decided side cusps and cutting 
points. The lateral teeth are like the centrals, but unsymmetrical and 
consequently bicuspid; there are about 16 perfect laterals. The marginals 
are purely aculeate in form, are arranged as usual in the genus (see Proc. 
A. N.S. Phila., 1875, 172), and all have a slightly developed side spur, 
making the tooth bicuspid. 
L. campestris has no side spur to its inner marginals, though it has such 
on the outer ones. Otherwise the dentition is about the same. 
In its. genitalia also, this species is nearly allied to Z. campestris, as 
will be seen in comparing my figure (pl. xii, fig. 4), with that of Dr. 
Leidy (Terr. Moll. U. S. pl. il, fig. 6). Limax Ingersolli, however, differs 
in the shape of its genital bladder and the shortness of the duct. 
With Limax montanus were specimens whose dentition (pl. xviii, 
fig. F), differs only in having a less number of teeth, 83£-1-34, with 12 
perfect laterals. The teeth are of the same type as in L. montanus. The 
animal is shorter, by about one-half. This form has been noticed as Z.. 
castaneus by Mr. Ingersoll, 1. c. p. 131. 
In dentition and genitalia Z. montanus differs from all the other species, 
native and introduced, thus far known to exist in North America. 
