1910.] NATURAL SCIENCES OF PHILADELPHIA. 135 



Fresno County, California. It is one of the very few forms common 

 to Arizona and the West Coast. 



VALLONIIDuEi Pilsbry. 

 Vallonia perspectiva Sterki. 



Summit of Cross J Mountain, Big Emigrant Canyon; Paradise 

 Canyon below Paradise; White Tail Canyon; Spring in lower Rucker 

 Canyon; Limestone Mountain. 



FERUSSACIDiE Bourguignat. 

 Cechlicopa lubrica (Mail.). 



Chiricahua Mountains: Ridge between White Tail Canyon and the 

 Pinery, Station 3; Jhu Canyon; Paradise Canyon; Cave Creek Canyon 

 at Stations 4, 5 and 11 and 14 F, very scarce; Barfoot Park; head of 

 Pine, 7,500 feet; Long Park, 8,000 feet; Box of Rucker Canyon. 



PUPILLIDiE Turton. 



Pupilladce Turton, Manual of the Land and Fresh-water Shells of the British 



Islands, p. 97 (1831). 

 Pupillidce, Pilsbry, Nautilus, XVIII, p. 107 (Jan., 1905). 

 PupidfB of authors. 



The northern (Canadian) forms of this group approach their southern 

 limit in the ranges of Southern Arizona. Vertigo is represented only 

 by a few puny forms at high elevations. The Upper Sonoran Bifidariae 

 predominate, especially those of the section Immersidens. 



The family name Pupillidce replaces Pupidce because the generic 

 term Pupa was not based upon a member of this family. 



Genus PUPILLA 'Leach' Turton. 

 Pupilla hebes (Ancey). 



Box in Rucker Canyon; Spring branch of Rucker. The sinistral 

 form of P. hebes (which we will call form nefas) was taken in Pine 

 Canyon, 7,500 feet (type loc), and at the head of Cave Creek, Station 

 14, at 8,000 feet. No dextral examples were taken at either of these 

 stations. 



Genus BIFIDARIA Sterki. 

 Bifidaria pellucida hordeacella (PUs.). 



Summit of Cross J Mountain, Big Emigrant Canyon; Paradise 

 Canyon below Paradise; White Tail Canyon; Cave Creek Canyon on 

 slope below the cave; Shake Gulch, Limestone Mountain. 



Bifidaria quadridentata Sterki. 

 Barfoot Park, one specimen. 



