396 GEOLOGICAL SUEVEY OF THE TEEKITOKIES. 



Limax castaneus, sp. nov. 



Small and slender; length less than one inch; color a lively hrown, with 

 a darlcer spot over the shield; head, tentacles, and eye-stalks Made; bottom 

 of foot white. 



Lingual dentition of Limax castaneus. 



Ja\^ as usual ; lingual dentition as in the other form, but differing in 

 having only 34-1-34 teeth, with 12 perfect laterals. This important 

 difference is such as to warrant the belief that the form may prove a 

 distinct species. Genitalia not examinued. 



Camp 10-11 : Blue Eiver Valley 5 specimens. 



The above Limaces were submitted to Mr. W. G. Binney for anatomi- 

 cal examination. The drawings and descriptions of the jaw, lingual 

 apparatus, and genitalia of both reproduced in the figures were fur- 

 nished by him, to whom really belongs the credit of discriminating their 

 specific distinction. 



Limax campestris, Binney. — Truckee, Nevada, 5,866 feet (Cooper), is 

 the only other mention I can find of the occurrence of this family in the 

 central basin j United States except Pacific slope. 



HELICINJE. 



Patula Cooperi, W. G. Binney. 



Camp 9 : Hot Sulphur Springs, Middle Park 7 specimens. 



Camp 11 : Blue River Valley 30 specimens. 



Lakes, San Luis Valley 2 specimens. 



Northeastern Colorado (Barber) = 100 specimens. 



California to Nebraska ; Montana to Arizona. Most of the many 

 recorded localities are in the mountains^ the highest being 5,500 feet. 



This well-known Helix, the largest of any collected, was not uncom- 

 mon in Middle Park and North Park, where great numbers of dead 

 shells would be found in isolated spots; only a few live ones being found 

 in wet places in the vicinity. In the Blue River Valley, crossed a belt 

 a hundred yards or so wide, and apparently miles in length, where the 

 surface was thickly strewn with bleached shells, as though an army of 

 these moUusks had been overtaken on the march by universal destruc- 

 tion.- There was a very perceptible difference between such specimens 

 as were found in shaded, humid places and those living in open and drier 



