1915. 



NATURAL SClEJsCZ:^ OF PHILADELPHIA. 



393 



Sonorella santaritana n. sp. PI. IX, figs. 1 to 3. 



The shell is depressed, umbilicate (the width of umbilicus con- 

 tained between 6 and 7 times in diam. of shell), solid, between cinna- 

 mon-buff and pinkish-buff, becoming whitish on the base, and 

 having a chestnut-brown shoulder band bordered with white. 



The surface is rather glossy. Embryonic shell of 1| whorls; after 

 a very short initial smooth stage, the surface becomes radially rippled, 

 then densely granular, the granules lengthened in an obliquely spiral 

 direction, becoming longer with the growth of the embryo, the last 

 f whorl of the embryo marked with threads forming V-shaped figures, 

 their intervals densely, subregularly wrinkled radially. 



The post-embryonic whorls have very fine, inconspicuous gro\\i;h 

 lines and excessively faint spiral lines on the last whorl, above and 

 at the periphery. The spire is very low conic. Whorls 4|, convex; 

 the last descends deeply in front. The aperture is very oblique, small; 

 peristome narrowly expanding, pale brown at the edge, the margins con- 

 verging, so that the thin, transparent parietal callus is short. In the 

 last whorl the umbilicus enlarges to about double its previous width. 



Alt. 13, diam. 23, width of umbilicus 3.6 mm.; aperture 

 10.5 X 12 mm. 



Santa Rita Mountains, Arizona, in Walnut Canyon (a branch of 

 Agua Caliente Canyon) at 

 about 6,000 feet elevation, 

 Station 5, Ferriss, Daniels 

 and Pilsbry, 13-IX-1910. 

 Type No. 112,105, A. N. S. P. 

 Also taken at Stations 11, 12, 

 13, 14, between 6,000 and 

 7,000 feet, near the head of 

 Agua Caliente Canyon; Sta- 

 tions 7, 8, 16, in Madera 

 Canyon, from about 5,700 to 

 nearly 7,000 feet, and at 

 vStations 9 and 10, in the head 

 of Josephine Canyon, near 

 the ridge connecting Mt. Hop- 

 kins and Old Baldy, at about 

 6,500 feet. 



Genitalia (fig. 4) . — The 



penis and vagina are extremelj' 



long. Penis is rather slender, t?- a r^ ■. v e q , ■> 



=■ _ _ ' Fig. 4. ^Genitalia of o. san/an^ana. epi., 



and lies in three folds in the epiphallus; pp., end of the penis-papilla. 



