130 



Vitrina limpida, Gould. 



Camp 24 : White-earth River, Northeast Antelope Park. 25 specimens. 



Camp 26 : Howardsville, Baker's Park 3 specimens. 



Camp D : Animas Valley 12 specimens. 



Eemarks. — I do not find this species anywhere recorded from the 

 central basin. It was, therefore, after long hesitation that I separated 

 these specimens from the following species, which includes the majority 

 of the Vitrincv collected, and has a co-extensive distribution. 



Vitrina PfeiiFeri, Newcomb. 



Camp 21 : Los Piuos Agency . . 25 specimens. 



Camp 23 : Timber Line, Northeast Antelope Park 15 specimens. 



Camp 26 : Howardsville, Baker's Park 40 specimens. 



Camp F : Rio La Plata 4 specimens. 



Camp P : Head of Mineral Creek 6 specimens. 



Carson Valley, Nevada [Ncwcoml))-, Lake Tahoe (Coo^Jtr) 5 head of 

 Gunnison River, Colorado [Carpenter). 



Remarks. — It will be noticed that all my localities are southern, but 

 at a great elevation, those from Mineral Creek having been collected in 

 a snow-storm. It is well kaown that ''the animal is very hardy; for, 

 according to Nilson, it is found crawling about among leaves in the 

 southern part of Sweden, in the depth of winter, and it is also found in 

 the most northern part of that country." The gentlemen of the United 

 States Exploring Expedition found their specimens almost universally 

 on the tops of mountains. 



Limax montanus, SP. NOV. 



Color Muish-gray. Form stout, with hliint posterior extremity. Length 

 exceeding one inch. 



Jaw as usual in the genus. Lingual membrane long and narrow. 

 Teeth 50-1-50, with 16 perfect laterals. Centrals with base of attach- 

 ment slightly longer than wide; inferior lateral angles not much pro- 

 duced, lower margin incurved ; reflection slightly shorter than one-half 

 the base of attachment; tricuspid, the outer cusps short, stout, bear- 

 ing short, stout cutting-points; the median cusp stout, reaching al- 

 most to the lower edge of the base of attachment, beyond M^hich pro- 

 jects the cutting- point; laterals like the centrals, but uusymmetrical, as 

 usual, by the suppression of the inner cusp with its cutting-point and 

 inner lower lateral expansion of the base of attachment. There are 16 

 perfect lateral, beyond which are several teeth forming the usual grad- 

 ual transition to the marginals. These latter are aculeate, the cutting- 

 points bearing at about the center of their lower edge a blunt spur, 

 which is a modified form of the bifurcation of the marginal teeth often 

 found in Umax. The marginal teeth have the usual characteristic 

 arrangement in oblique rows, and the separate teeth, as they pass out- 

 ward, have at first the usual rapid increase for a short distance, and 

 thence gradual decrease in size. 



A reference to the exhaustive article on the lingual dentition of 

 American Fulmonata, about being published in the Proceedings of the 

 Philadelphia Academy of Natural Sciences, 1875, by W. G. Binney, 

 shows that this species differs in its dentition from all the Limaces 

 now known to inhabit North America. L.jiavus and maximus have no 

 cutting-points to the side-cusps of centrals and laterals. L. Hewstonihas 

 well-developed inner cutting-points to its inner lateral teeth, which, in- 



