lyo UNIVERSITY OF COLORADO STUDIES 



Genus POLYGYRA (Say) Pilsbry 



Polygyra monodon Rack. Fig. 5. 



Stenotrema monodon, Colorado Springs, Yarrow 68, 929. 

 Helix monodon, Colorado Springs, Cockerell 14, 103. 

 This should probably not be included in the Colorado moUuscan 

 fauna. It is an eastern species, collected long ago and. not since 

 Fig. s-— PolygjTa reported from this state. We see' no reason to doubt the identity, 

 monodon. ^^^ ^^it specimens must have been accidentally introduced and have 



evidently not become incorporated into the permanent fauna. 



A box full of P. clausa Say was found in the Maxwell collection in the University 

 Museum containing a card bearing the word " Colorado," but it was not in Mrs. Max- 

 well's handwriting and the source of the label is unknown. So conspicuous a species 

 would probably not occur in such numbers without being obsers'ed by other collectors, 

 and if Mrs. Maxwell had collected these in Colorado there would probably have been 

 other common land shells with them. 



Genus PUPOIDES Pfeiffer 



Pupoides marginatus Say. 



Pupa jallax Say. South Park, Twin Lakes and Pagosa, Yarrow 68, 926. 



Pupa arizonensis Gabb. (not Pils. & Van.). "From El Paso County, according to 

 Tryon, but not found since." Cockerell 22, 63. This may be hordaceus. 



Trinidad (Pilsbry), Vanatta Mss. v 



Pupoides hordaceus Gabb. Fig. 6. 



Trinidad (Pilsbr}'), Vanatta Mss. 



Pupa hordacea Gabb. Williams Canyon, Sampson 46, 102. 

 Pupa arizonensis W. G. B. and Pupa saxicola Ckll., Colorado, 

 Sterki 57, 4. 



Pic_ 5_ Pupoides Pupa gabbi mexicanorum Dall. Round Mt., Cockerell 29, 143. 



herdaceous. Pupa arizonensis saxicola Ckll. Round Mt., Cockerell, Zoe, 



Vol. II, 1 89 1, p. 18. Placed under hordaceus with hesitation, adding, 

 "We know nothing of the Colorado shells called P. arizonensis var. saxicola by Mr. 

 Cockerell," Pilsbry & Vanatta 44, 588, 589. Dr. Sterki writes Prof. Cockerell that he 

 has two specimens, dead and somewhat weathered, short as compared with some New 

 Mexico specimens' and with slighter, more crowded stria:. 



Genus PUPILLA Leach 



Pupilla muscorum Linne. 



Blue River Valley and Los Pinos Agency, Ingersoll 35, 390. Twin Lakes, 9,500 ft.. 

 Yarrow 68, 927. Greeley (L. C. Wooster), Estes Park (Rev. E. H. Ashmun), Black 

 Lake Creek (Cockerell), Trinidad (PilsbrjO, Vanatta Mss. 



Pupa muscorum. Colorado, Pilsbry 38, 45; Pilsbry & Johnson 43, 20. Pike's 

 Peak, 10,000 ft., Cockerell 30, 130. Roimd Mt., with one specimen of var. albina Menke, 

 Cockerell Mss. 



We have found it fossil at mouth of Bear Canyon, three miles south of Boulder, and 

 have received specimens collected by Prof. Cockerell at Lake George and by Mr. D. M. 

 Andrews at Magnolia. Prof. E. Bethel has sent us a few specimens found fossil by 

 Prof. Geo. L. Cannon in ancient overwash of the South Platte near Denver. 



