1918.] 



NATURAL SCIENCES OF PHILADELPHIA. 



315 



Graham Co., Arizona; in a "malpais" rock slide, about 4,800 ft. 

 elevation, type No. 109,110 A. N. S. P. paratypes in Ferriss Coll.; 

 collected by J. H. Ferriss, 11-14-1913. 



The shell recalls S. bowiensis Pils., differing by the wider last 

 whorl, smaller aperture and somewhat smaller umbilicus; also much 

 less distinct sculpture of the embryonic whorls. The genitalia, 

 examined in several individuals, differ by the very small size of the 

 male organs, relativeh^ even smaller than in S. hachitana and its 



Fig. 10. Genitalia of .S'. 

 and flaseUum. 



delicata. a, outline of penis-papilla, epiphallus 



immediate relatives. It differs from these by the cylindric penis- 

 papilla with bluntly conic end. The genitalia of S. walkeri P. & F., 

 of the Santa Ritas, have considerable similarity. 



The living animal has an odor like S. odorata in the Santa Catalinas. 



Sonorella caerulifluminis n. sp. PI. VI, figs. 1 to 1. 



The shell is depressed, umbilicate, the umbilicus contained about 

 8 times in the total diameter, somewhat translucent, nearly Isabella 

 color, having a chestnut-brown band at the shoulder, showing above 

 the suture on the penult and usually half of the next earlier whorl, 

 and without white bordering bands, though the shell may be slightly 

 paler there. It is somewhat translucent throughout. Surface 

 glossy. Embryonic portion of 1^ whorls, at first with some radial 

 ripples, then irregularly pitted-granulose, with weak oblique threads 

 as in others of the S. hachitana group. First post-embryonic whorl 

 is weakly striate and minutely papillose; later whorls with sculpture 

 of delicate, irregular growth-lines only. The whorls are moderately 



