1915.] NATURAL SCIENCES OF PHILADELPHIA. 385 
The penis is long, its lower half very slender, enveloped in a long 
sheath composed of glossy circular muscular tissue. The upper 
half is somewhat swollen. The penis-papilla (fig. 1a) is rather short, 
cylindric, very faintly wrinkled transversely, the distal end obtuse, 
rounded. The flagellum is about 0.8 mm. long. The vagina is 
about half as long as the penis. Other 2 organs as usual in the 
genus (Pl. XI, fig. 1, from Station 1, near Bisbee, No. 103,095). 
Length of penis 14 mm.; epiphallus 11 mm.; penis-papilla about 
5 mm.; vagina 7 mm.; spermatheca and duct 22 mm. 
Mule Mountains: Mt. Ballard, in the Escabrosa Ridge; about 
2 miles west of Bisbee, Arizona, on a ledge of the north side near the 
summit. Type No. 103,095, A. N. 8. P., collected by Pilsbry, 
August 31, 1910. It was also taken on the northern slope of a 
limestone hill about two miles east of Warren, Arizona. 
Other specimens from the type locality measure as follows: 
Alt. 10.8, diam. 20 mm.; umbilicus 3.8 mm.; whorls 43. 
LO; 18.8 ‘* whorls 43. 
“ce 9.8, ce 18 ce 
Boro. lisa 
cc 8, igs 16.4 6c 
fee dete ALB “ogmbilieus 2.9 mm; whorls 43. 
“cc ie c 14 ce (a9 3 “ce (74 4i. 
The shell is quite characteristic by its conspicuous white bands 
bordering the dark band at the shoulder, the rather open umbilicus, 
and the nearly circular, strongly oblique aperture. It is a handsome 
snail when fresh, not closely resembling any other species we have 
seen. Its nearest neighbor is S. mearnsi Bartsch, from San José 
Mountain, which lies just south of the international boundary near 
Naco, a railroad station on the El] Paso and Southwestern R. R. 
S. mearnst- has a narrower umbilicus, less conspicuous white bands, 
only 4 whorls, the periphery of the last somewhat subangular, and 
the surface is very minutely granular. 
The hairs of the neanic whorls are very delicate and fugacious; 
but when they are gone the spire still remains rougher than the last 
whorl, having an indistinct pattern of radial wrinkles or irregular, 
long granules. This disappears entirely on the last whorl. The 
embryonic whorl (beyond the initial half-whorl, which is alike in 
nearly all Sonorellas) is not marked with the protractive raised 
lines or series of granules of S. hachitana and its numerous group. 
By its genitalia S. bartschi resembles the Chiricahuan S. bowiensis, 
but that differs by having close, finely developed sculpture of threads 
