Jaw and Lingual Dentition of Pulmonata. 169 



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 (pi. 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, Iugersoll. 



(Report on Nat Hist, of U. S. Geolog. and Geogr. Survey of the Territories, 



1874, p. 130.) 



This species was found by Mr. Ernest Iugersoll, 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 L. 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 (pi. 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 L. campestris, as 

 will be seen in comparing my figure (pi. xii,' fig. 4), with that of Dr. 

 Leidy (Terr. Moll. U. S. pi. ii, fig. 6). Limax Imjersolli, however, differs 

 in the shape of its genital bladder-and the shortness of the duct. 



With Limax montanus were specimens whose dentition (pi. xvili, 

 fig. F), difi'ers only in having a less number of teeth, 34-1-34, with 12 

 perfect laterals. The teeth are of the same type as in L. montamis. The 

 animal is shorter, by about one-half. This form has been noticed as L. 

 castaneus by Mr. Ingersoll, 1. c. p. 131. 



In dentition and genitalia L. montanus differs from all the other species, 

 native and introduced, thus far known to exist in North America. 



