102 THE NAUTILUS. 



Routt Co. ; Pueblo Co. (R. Cusack) ; Hardscrabble Canon, Custer 

 Co.; Black Lake Creek, Summit Co.; Pottery Pass, about 11,500 

 feet, Summit Co.; Red Cliff, Eagle Co.; near Glenwood Springs, 

 Garfield Co. ; near Buzzard Creek, Mesa Co. ; Surface Creek, 

 Delta Co. ; near White Earth Creek, Gunnison Co. 



P. strigosa cooperi form typica Ckll. Canon City (T. INIorgan) ; 

 Cave of the Winds, Manitou (E. W. Roper), aud many other 

 localities. 



P. strigosa cooperi form trifasciata Ckll. Mesa Co. 



P. strigosa cooperi form confiuens Ckll. West Mountain Valley, 

 Custer Co. ; Garfield Co. ; Mesa Co. 



P. strigosa cooperi form elevata Ckll. Delta Co. 



P. strigosa cooperi var. depressa nov. Shell flattish, max. diam. 

 21 i, alt. 122 mill. Specimens of this variety were sent to me by 

 Miss A. Eastwood, who found them in a canon near Durango. 

 The same variety is figured by Biuney, Man. Amer. Land Shells 

 (1885), p. 166, fig. 153. 



P. strigosa cooperi form major nov. Shell with diam. 25 mill. 

 Near head of Korth Mam Creek, Mesa Co., Sept. 14, 1887. 



P. strigosa cooperi var. minor Ckll. Xear Egeria, Routt Co., 

 abundant. It is quite a distinct local race. 



P. strigosa var. hemphilli (Newc.) William? Canon, Manitou 

 (Binney). This perhaps recjuires confirmation. The examples of 

 strigosa I have seen from Williams Canon are ordinary cooperi. The 

 young of cooperi is keeled. 



P. striatella (Auth.) Twin Lakes and South Park (Yarrow) ; 

 Este's Park (Binney) ; Grand Co. (Ingersoll) ; Gilpin Gulch (H. 

 Prime) ; Williams Canon, Manitou (M. E. Cusack) ; Swift Creek, 

 Custer Co.; Kremmling, Grand Co.; Rock Creek, Routt Co.; 

 Powderhorn, Gunnison Co. ; Divide Creek and near Cattle Creek, 

 Garfield Co. ; Buzzard Creek, Mesa Co. ; Black Lake Creek, Sum- 

 mit Co. 



P. striatella form nlbiiia (j\rorse). !Near Mam Mts., JNIesa Co 

 Difl^ers from the type in having a white shell. 



P. ruderata var. cronkhitei (Newc.) Blue River Valley (Inger- 

 soll) ; Cottonwood Gulch, Saguache Co. ; Micawber Mine, Chester Co. 



P. ruderata cronkhitei form viridula nov. Shell greenish-white. 

 Micawber Mine, Custer Co. 



P. ruderata var. gorktschana Mouss. Ouray Co. (Binney). 



P. (Pimctum) pijgmcta var. minutissima (Lea). Willow Creek, 



