174 UNIVERSITY OF COLORADO STUDIES 



Genus VITREA Fitzinger ' 

 Vitrea hammonis Strom. 



Colorado, Pilsbry & Johnson 43, 25. Buzzard Creek, Divide Creek and Black 

 Lake Creek (specimens from Cockerell), Trinidad (Pilsbr)')i Vanatta Mss. 

 l::^;' Zonites viridula Menke. Blue River Valley, Saguache Creek, 20 miles west of 

 Saguache, Cascade Creek in Animas Valley and Rio LaPlata, always at foot of moun- 

 tains, wet, shaded ground, beside running water, Ingersoll 35, 393. South Park, Yar- 

 row 68, 934. 



Hyalina radiatula Alder. Custer, Pueblo, Mesa and Garfield Counties, Cockerell 

 22, 62, 64. Buzzard Creek, Cockerell 15, 360. 



Hyalina radiatula viridescenti-alba Jeffreys. Custer and Mesa Counties, Cockerell 

 14,101; 22,62; Buzzard Creek, Cockerell 15,360. 



Vitrea radiatula Alder. Subfossil at Grape Creek, Cockerell Mss. 



Genus VITRINA Draparnaud 

 Vitrina alaskana Dall. Fig. 14. 



Vitrina pfeifferi Newc. Head of Gunnison River, Binney 5, 623. Los Pinos Agency* 

 divide southwest of Los Pinos, Howardsville, Rio LaPlata, head of 

 Mineral Creek and head of Gunnison River, Ingersoll 35, 394. Ft- 

 Garland and Twin Lakes, Yarrow 68, 932. Colorado, Binney 6, 

 Fig. 14. — Vitrina 88; Pilsbry & Johnson 43,' 25. East Fork Arkansas River in Lake 

 alaskana. County, near Cattle Creek, near Mam Mts., Breckenridge and 



Rock Creek, Cockerell 22, 62; 14, 100. Wet Mt. Valley, Northrop, 

 near Zion Peak, West Ten Mile Creek, Straight Creek, Black Lake Creek, near Cattle 

 Creek, near head North Mam Creek, north of Buzzard Creek, West Fork Clear Water 

 Creek, Surface Creek and East Twin Mesa, Cockerell Mss. 



Vitrina limpida Gld. Clear Creek, Howardsville and Animas Valley, Ingersoll 35, 

 394. South Park, Yarrow 68, 933. Dillon, Swift Creek, Grand Mesa, Wales Canyon, 

 Cottonwood Gulch, near Mam Mts. and West Fork Surface Creek, Cockerell 14, 100. 

 Colorado, Dall 34, 365. 



V. pellucida. Custer and Saguache Counties, Cockerell 22, 62, 64. 

 Vitrina alaskana Dall. Mesa and Saguache Counties, Black Lake Creek and Buz- 

 zard Creek (Cockerell), North Park (E. A. Barber), Vanatta Mss. 



This species is rather common from Boulder to an altitude of about 11 000 feet. 

 The finest specimens we have found were collected at Eldora. It seems probable that 

 Dr. Dall's name proposed in his paper on the Mollusks of Alaska, should stand for this 

 well-known species, as pfeifferi is said to be preoccupied. 



Genus EUCONULUS Reinhardt 



Euconulus trochiformis Dall. Fig. 15. 



Euconulus fulvus Drap. Pike's Peak, 10,000 ft., Cockerell 

 30, 130. Rio LaPlata, White Earth, Wet Mt. Valley, West Ten 

 Mile Creek, Straight Creek, Divide Creek, North Mam Creek, 

 North Park, subfossil at Grape Creek, Cockerell Mss. North 

 Park (Barber), Buzzard Creek, Black Lake Creek and Swift 

 Fio. 15. — Euconulus Creek (Cockerell), Vanatta Mss. 

 trochiformis. Zonites fulvus. Hot Sulphur Springs, mouth of Blue River, 



" Vitrea alliaria Drap. 



A single specimen was found in February, IQ07, by Mr. Guy H. Mason, at Knudson's greenhouse, 

 Boulder, and presented to the University museum by Professor Cockerell. The identity has been confirmed 

 by Dr. W. H. Dall. This being a European species and as yet found only in a greenhouse, it can hardly be 

 considered a member of our Colorado fauna, but is noted here because it may easily become incorporated 

 into the fauna by escaping from hothouses, as Agriolimax agrestis was probably introduced. 



