56 UNIVERSITY OF COLORADO STUDIES 



Ohio City, Gunnison County, 11,800 feet (Frank Rohwer); Floyd Hill and Beaver 

 Brook, near Golden (Hand); Treasury Mt., Gunnison County, io,goo feet (George); 

 Hagerman Pass, west of Leadville, 12,700 feet (Aurand); Morrison (F. Rohwer and 

 Henderson); Steamboat Springs and Rifle Gap (Henderson); nine miles north of Boulder 

 (Spangler). Semi-fossil at Pueblo. All the Oreohelices of the strigosa type in Colorado 

 are now referred to this variety. 



Oreoheliz cooperi W. G. B. 



Treasury Mt., near Marble, Gunnison County, 10,900 feet (George); five miles above 

 Gleneyrie, Jackson County (Fleming); Eldorado Springs, Wolcott, Toponas and Mont- 

 rose (Bethel); South Canyon, near Glenwood Springs (Duce); Crested Butte and Brush 

 Creek, Gunnison County (Warren). East of the Continental Divide this species is seldom 

 or never found alive, but west of the Divide it is much more common than depressa. I 

 have found it very abundant along the Grand Hogback from Newcastle to Meeker and 

 Axial, less abundant up White River to Trapper's Lake, very abundant in North and Middle 

 Parks and at Steamboat Springs. We have one reversed specimen from Middle Park. 



Oreoheliz cooperi minor Cockerel). 



In Part II, I suggested the identity of minor Cockerell and concentrate Dall. 

 Last summer I collected what appears to be typical minor at McCoy, near Professor 

 Cockerell's type locality, and have been able to compare them directly with typical 

 concenlrata furnished by Dr. Dall. Dr. Dall has also permitted me to examine the speci- 

 men from Alpine, Chaffee County, between 10,000 and 12,000 feet, identified by him as 

 concentrala and so recorded by Professor Cockerell (Nautilus, XVI, pp. 106-107). Unfor- 

 tunately the apex of the shell was crushed in its original transmission to Washington, but 

 a comparison with typical concenlrata and minor makes it quite clear that it is the latter. 

 Therefore concenlrata is eliminated from the Colorado fauna. I also found two colonies 

 of minor near Meeker and one at Sulphur Springs. We have specimens from Placerville 

 in San Miguel County and Montrose (Warren) ; Ohio City, Gunnison County (F. Rohwer) . 

 It is also interesting to note its occurrence in Johnson County, Wyoming (Betts). We 

 have one reversed specimen from McCoy. 



Oreohelix haydeni Gabb. 



This species, ornamented by strong spiral ridges, was found alive in great numbers 

 by Messrs. Bethel and Dakan, independently, at Glenwood Springs, the only known 

 Colorado locality for the species. 

 Oreohelix haydeni gabbiana Hemphill. 



Found in great numbers at Glenwood Springs (Bethel, Dakan), Newcastle (Dakan), 

 and east of Meeker (Henderson). 

 Oreohelix n. sp. 



A very fine colony on Little Thompson Creek, northeast of Lyons, was found by 

 Mr. Dakan. The species is considered new. 



Genus THYSANOPHORA Strebel and Pfeiffer 

 Thysanophora ingersolli Bland. 



Near Marvine Lodge, Rio Blanco County (Felger); west of Allen's Park, at 9,000 

 feet (Spangler); Rio Blanco and Trapper's Lake (Henderson). 



