THE MOLLUSCA OF COLORADO 185 



Zonites nitidus Miill. 



Carpenter, lO, 542. Species merely listed in a list of alpine insects. Probably a 

 case of mistaken identity. Record included in Prof. Cockerell's list, 14, 100. 



Vertigo rowelli Newc. 



"A species referred by Mr. Pilsbry to P. rowelli Newc," Surface Creek, Cockerell 

 22, 65. In a subsequent paper this species is listed only from California and Oregon, 

 the Colorado record being disregarded, Pilsbry & Vanatta 44, 610. 



Vallonia costata Miill. 



"West to Colorado." Pilsbry &l Johnson 43, 7. We are aware of no records which 

 may be considered safe. See V. cyclophorella. 



Lymnaea aff. rowelli Tryon. 



Rio Grande County, Cockerell 22, 64. Identity uncertain and cannot now be 

 determined. 



Lymnaea ferruginea Hald. 



Between Animas and LaPIata, IngersoU 35, 406. Recorded with doubt as to identity 



Lymnaea traski Tryon. 



Colorado, no definite locality, IngersoU 35, 406. A Pacific Coast species. We 

 suspect a mixing of labels or mistaking abbreviation of California for Colorado. 



Pleurocera sp. 



"Among mollusks Pleurocera and Pisidium were observed in the Pike's Peak lakes." 

 Ward 67, 143. Probably refers to some species of Lymnaa. 



Somatogyrus subglobosus Say. 



Five specimens from San Luis Valley lakes, IngersoU 35, 390. We dare suspect 

 that these were very depressed Lymncea bulimoides cockerelli. 



