1918.| NATURAL SCIENCES OF PHILADELPHIA. 289 
It lives in relatively dry rock slides, with the smooth Sonorella 
marmorarius, high on Marble Peak and its flanks, thus differing in 
habits from S. odorata. The shell is readily separable from odorata, 
and perhaps it should be considered a separate species. It has the 
same peculiar odor. 
Sonorella sabinoensis n. sp. PI. IV, figs. 1 to 5d. 
The shell is rather narrowly umbilicate (width of umbilicus con- 
tained 8 times in that of shell in the type specimen), rather solid; 
cinnamon-buff, broadly zoned with white (or whitish) on both sides 
of the chestnut-brown band above the periphery. The surface is 
glossy; embryonic whorls having the usual sculpture of the hachitana 
group, granular, with divaricating protractive threads below and 
retractive above; subsequent whorls delicately marked with growth- 
lines. Suture descends moderately in front. The aperture is large, 
oblique, rotund-oval. Peristome narrowly expanded, dilated at the 
umbilical insertion. 
Alt. 12, diam. 21.2 mm.; aperture 12x13 mm.; 43 whorls. 
Santa Catalina mountains, Arizona, in Sabino canyon (type loc. 
Station 16, 1913) and its tributaries, Sycamore canyon and Mt. 
Lemon Fork, from about 3000 to 6000 feet elevation. Also Rock 
and Vantana canyons, west of Sabino, and Bear canyon eastward. 
It is a species of the dry, sun-baked rock-slides, living ones found 
only deep in the crevices, in the lower levels of desert vegetation. 
The Sabino Basin, Sycamore and Bear canyon localities are below 
the pine belt, in arid country, with some oak, juniper and sycamore. 
‘The species is not known to occur in the humid upper forest. 
Genitalia (fig. 3, a-d) resembling those organs in S. marmorarius. 
The penis is thin, not swollen basally. The penis-papilla is slender 
and corrugated, as in the other species, and nearly as long as the penis 
(fig. 3a). The flagellum is either minute or wanting. 
Wipiphal || Fiagel- 
| 
Mus. No. Penis. | Papilla. | ~~ jus. lum. | Vagina. | 
109,097 10 ha 2a 8 0 9 | Type, fig. 3c. 
109,092 905) | 8 7 0 ihe 
109,094 10.5 | 10 9 —l 9 | Fig. 3d. 
109,087 9 iNeed 6 0.3 Bua tl 
8.5 8 6.5 0.5 6.5 | Fig. 3a, b. 
109,098 | 
| stu | 
Shells from the type station measure from 20 to 24 mm. diameter. 
The relative size of the aperture also varies within rather wide limits. 
In the type specimen (pl. IV, figs. 2-2b) the width of aperture is con- 
