318 PROCEEDINGS OF THE ACADEMY OF [NoV.-DeC, 



The size of the shell is rather variable, the extremes of diameter 

 in a series from Station 17 being 20 and 24.6 mm. The largest 

 specimen noticed measures 26.4 mm. An individual without a 

 dark band is photographed in fig. 4. It is from Station 19, Blue 

 River, at the mouth of Pigeon Creek. Two other shells from this 

 station are illustrated in figs, 2, 2a and 3, 3a. 



Sonorella binneyi franciscana n. subsp. PI. VI, firrs. 5, ofi, 56. 



The shell is umbihcate (width of umbilicus contained 9 to 10 

 times in that of shell), light pinkish cinnamon with some paler or 

 white oblique streaks and indistinctly paler on both sides of a chest- 

 nut-brown band above the periphery. This l^and shows above 

 the suture of the last half of the penult whorl. The surface is glossy; 

 embryonic shell of about 1 V2 whorls, the first half having some radial 

 ripples, the next whorl minutely granulate, having obliciue, curved 

 threads, protractive below, retractive above; the later whorls with 

 fine, unequal growth-lines. The whorls are convex, slowly increasing 

 at first, the last rapidly widening, descending a little in front. The 

 aperture is unusually large, shortly oval-lunate. The peristome is 

 very narrowly expanded, straightened and dilated towards the 

 columellar insertion. 



Alt. 11.6, cliam. 19mm., aperture 9.8x11.5 mm.; 4| whorls. 



San Francisco River, Graham Co., Arizona; type locality, Station 

 92 (1913), above Sardine Creek. Also taken at Station 93 in the 

 same vicinity, and at Station 13 (1914), 2 miles above Harper's. 

 Ferriss and Daniels. 



The head and back are dark grayish brown shading into dark 

 vinaceous drab downward and backward, the tail light colored. 



Genitalia (Fig. 126). The penis contains a cylindric papilla with 

 blunt, rounded end. The epiphallus is about twice as long as the 

 penis, and bears a small flagellum. The penial retractor inserts on 

 the epiphallus sovie distance {over f mm.) above the penis. The vagina 

 is nearly or about as long as the penis. Measurements follow: 



Station 13 13 93 



Length of penis 5 6 7 mm. 



papilla 2 2.3 3.5 



epiphallus 10.5 10 10.5 



flagellum 0.5 0.7 small 



penial retractor 3.3 



vagina 4.7 5 5.5 mm. 



Museum No 119,044 119,044 109,413 



By its genitalia and shell this subspecies is closely related to S. 



It 



