THE MOLLUSCA OF COLORADO 59 



Nautilus, Vol. XXI, pp. 131-132). The latter had been recorded by me inadvertently 

 as Zonitoides alliaria {Nautilus, Vol. XX, p. 144), but appeared under its proper name 

 in Part II of this catalogue. 



Vitrea hammonis Strom. 



Specimens of this species from Rio Blanco County were identified by Dr. Wm. H. 

 Dall as V. rhoadsi Pilsbry, and recorded by me under that name {Univ. of Colo. Studies, 

 Vol. VII, p. 126). They have been submitted to Professor Cockerell and Dr. Pilsbry, 

 who both agree with me that they are of the form usually called hammonis. Taylor 

 {Monograph of the Land and Fresh-water Mollusca of the British Isles, part 15, 1908) dis- 

 cards the name hammonis because of the difficulty of identifying it from the descriptions, 

 and calls the species Hyalinia radiatula, and Professor Cockerell records his Tolland 

 specimens under the name Vitrea radiatula electrina var. alba (Jeffreys) Taylor {Nautilus, 

 Vol. XXV, p. 5S). I have never found more than two or three specimens at one place, 

 always mingled with larger numbers of Zonitoides arboreus. Our present material 

 permits the addition of the following localities: Tolland (Cockerell, Dodds); Floyd 

 Hill (Hand) ; Long's Peak Inn (Spangler) ; Copeland Park and Allen's Park (Rohwer) ; 

 Buford and ten miles east of Meeker (Henderson). 



Genus VITRINA Drapamaud 

 Vitrina alaskana Dall. 



Generally distributed in aspen groves throughout the mountains of the state. Allen's 

 Park, Copeland Park and North Boulder Creek (S. A. Rohwer); Tolland and Sulphur 

 Springs (Dodds); Floyd Hill (Hand); Morrison and near Ohio City (F. Rohwer); Pike's 

 Peak at 10,000 feet (Cockerell); Axial in Routt County, Box Elder in Larimer County, 

 upper Muddy Creek in Grand County, southwest corner of North Park in Jackson 

 County, Buford, near Meeker, Rio Blanco, Mud Spring and Marvine Lodge in Rio 

 Blanco County (Henderson). 



Genus EUCONULUS Reinhardt 



Euconulus fulvus alaskensis Pilsbry. 



North Boulder Creek at 9,000 feet and Copeland Park at 7,500 feet, both in Boulder 

 County, and Troublesome Creek in Grand County (S. A. Rohwer); west of Allen's Park 

 at 9,000 feet (Spangler); Floyd Hill (Hand); Tolland (Dodds, Cockerell); Pike's Peak 

 (Cockerell); near Ohio City (F. Rohwer); Box Elder in Larimer County, Magnolia at 

 8,500 feet, South Boulder Canyon at 6,800 feet, Southwest comer of North Park, Rio 

 Blanco and along White River from Meeker nearly to Marvine Lakes (Henderson). The 

 former Colorado records under the name E. trochiformis (Montagu) Dall are believed to 

 belong here. 



Genus ZONITOIDES Lehmann 

 Zonitoides arboreus Say. 



Palmer Lake and Eldorado Springs (Bethel) ; Pike's Peak at 10,000 feet, and Sugar 

 Loaf (Cockerell); Ward at 9,000 feet, and Tolland (Dodds); Floyd Hill at 7,200 feet 

 (Hand); west of Allen's Park at 9,000 feet, and Long's Peak Inn (Spangler); northeast 

 of Ohio City (F. Rohwer); North Boulder Creek at 9,000 feet, Copeland and Allen's 

 Park, all in Boulder County, and mouth of Troublesome Creek in Grand County (S. A. 



