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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, relatively even smaller than in S. hachitana and its 
Fig. 10. Genitalia of S. delicata. a, outline of penis-papilla, epiphallus 
and flagellum. 
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 cerulifluminis n. sp. Pl. VI, figs. 1 to 4. 
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 14 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 
