316 



PROCEEDINGS OF THE ACADEMY OF [Nov.-Dec, 



convex, the last descending slowly in front. The aperture is rounded 

 oval-lunate, large. Peristome expands a little and is dilated at the 

 columellar insertion. 



Alt. 14.6, diam. 25 mm.; alt. of aperture 12.3, width 14.3 mm.; 

 4| whorls (type, Station 18). 



Blue and San Francisco Rivers, Graham Co., Arizona, the type 

 (No. 119,048 A. N. S. P.) from Station 18 (1914), San Francisco 

 River 6 miles above its confluence with the Blue River. Found also 

 at Stations 5, 8, 10, 15, 16, 17, 19, 20 (1914), and 89, 91 (1913); from 

 Ash Canyon, 6 miles above Clifton, to the mouth of Sardine Creek 

 on the Blue River. The higher of these colonies are at little more 

 than 4,000 ft. 



While closely related to *S. hachitana, it differs from that by the 

 absence of white bands bordering the shoulder-band, and of a white 

 umbilical area, by the suture descending less deeply and not so 

 al^ruptly in front, and by the smooth penis-papilla. 



Fig. 11. Genitalia of Sonorella cu'rulijluminis. a, No. 119,048, Station IS, 

 typical, with enlarged detail of penis-papilla; h, No. 119,042, Station IG; c, 

 Station in, No. 119,046. 



