184 UNIVERSITY OF COLORADO STUDIES 



Physa hawnii Lea. 



Specimens from McCall's Lake (Dodds and Markman), Florence (Kenyon) and 

 Canyon City (Miss Voight), are identified as hawnii by Dr. Bartsch, but he adds that 

 they may be occidentale or even gabbi. 



Many of- the foregoing records of Physae may be doubted without seriously hurting 

 the feelings of the writer or his advisers. 



Genus APLEXA Fleming 



Apleza hypnorum Linne. Fig. 48. 

 -Aoiexa hvp- Bulinus hypnorum. Grand River VaUey and Bear River, 



Ingersoll 35, 401. 



Physa hyptwrum. West CUff, Cockerell 22, 63. Subfossil at 

 Grape Creek, Cockerell Mss. 



Numbers were collected by Prof. A. E. Beardsley, of the State Normal School, at 

 Greeley, and by Prof. E. Bethel, of Denver, in an overflow ditch at Granby. The latter 

 has sent us specimens believed to have been collected by Dr. T. W. Stanton at Del Norte. 



^£=>^ Genus VALVATA Miiller 



^-^^ Valvata lewisi Cumer. Fig. 49. 



Fig. 49.— Val- Colorado, Dall's "Land and Fresh Water Mollusks, Harriman 



vata lewisi. Alaska Expedition," Vol. XIII, p. 123. 



Valvata sincera Say. One specimen at San Luis Valley lakes, 

 Ingersoll 35, 390. 



REJECTED RECORDS 



Anodonta dejecta Lewis. 



Arkansas River, west of locth Meridian, Yarrow 68, 952; Cockerell 22, 62. This 

 locality is believed to be certainly erroneous. See Simpson 49, 52. 



Pisidium pusillum Gmel. 



Custer and Saguache Counties, Cockerell 22, 64. This species is European, not 

 reported from elsewhere in America, and in view of the difficulties of the genus and the 

 unsatisfactory status of the western species, it may be safely disregarded. 



Pisidium mesae Ckll. 



"A small Pisidium, having apparently the same relation to P. pusillum that P. 

 roseum has to P. nitidum, is provisionally called P. mesce. It is from the southern slope 

 of Grand Mesa, in Delta County; it may prove to be but a variety of P. pusillum." Cock- 

 erell 22, 65. Apparently described from a single specimen. The description not being 

 sufficient to make it recognizable, as Dr. Sterki writes, especially in such a variable genus, 

 it must for the present be considered a nomen nudum. 



Helix nemoralis. 



Two or three specimens liberated at West Cliff, Cockerell 14, 100. They could hardly 

 become incorporated in the fauna of the state. 



Epiphragmophora coloradensis Stearns. 



Erroneously credited to Colorado in Dall's list (34, 366), but correctly assigned to 

 Arizona in the text at page 340. 



