1918.1 



NATURAL SCIENCES OF PHILADELPHIA. 



293 



Alt. 16.7, diam. 25.6 mm.; 5^ whorls (type; Figs. 2-26). 



Buehman canyon, in the eastern part of the Santa Catalina Moun- 

 tains, the type from Station 44 (1913), near the Korn Kobb mine. 

 Also at Stations 41,^Jiead of Sycamore gulch, tributarj^ to Buehman 

 canyon, 42, Buehman canyon at the Brush Corral, and station 43, 

 Buehman canyon a mile below the Brush Corral Ranger Station. 



Fig. ,5. Genitalia of Sonorella sabinoenfiis buehmanensis, No. 109,196. 



There is considerable variation in the shells from Buehman can- 

 yon, in size, degree of elevation and number of whorls; yet unless 

 anatomical differences are found, we consider them all of one race. 

 As yet, only the typical form has been dissected. 



Specimens from Station 41 (1913), from the head of Sycamore 

 Gulch, have the umbilicus slightly more open than in typical bueh- 

 manensis, and the borders of the shoulder-band are paler; thus 

 approaching the larger forms of S. sabinoensis. 



In Stations 42 and 43 the size varies widely, and the smaller 

 specimens have only a fraction of a whorl more than sabinoensis, 

 from which they differ by the smaller aperture. One figured (pi. V, 

 figs. 3-36, Station 43) measures: alt. 13.7, diam. 21 mm. In the same 

 lots the larger shells have a diameter of 25 mm. or slightly more. 



Like other species of the dry lower mountains, living snails are 

 rare. In one rock slide in Buehman Canyon, 360 fairly good "bones" 

 were found, and only 8 living snails. 



