20 THE NAUTILUS. 
Sonorella patagonica, n. sp. The shell is rather capacious with 
umbilicus about one-seventh the diameter, polished, rather 
solid, the band rather wide, pale-bordered on both sides, sculp- 
ture and form about as in S. papagorum P. & F. The vagina is 
swollen at base; penis-papilla large, tapering, conspicuously 
wrinkled transversely; flagellum distinct. Alt. 18, diam. 
22 mm.; nearly 5 whorls. Itisoften larger. Mt. Washington, 
Patagonia Mts. 
Bulimulus nigromontanus, n. subsp. Differs from B. nigro- 
montanus by the narrower umbilicus, and is therefore tempor- 
arily separated as a subspecies. Pina Blanca in the Pajarito 
Mountains. 
Sonorella mustang, n. sp. The shell is rather openly umbili- 
cate, dilute cinnamon-buff with a pale-bordered dark band, 
glossy, nearly smooth, the embryonic shell coarsely, irregularly 
wrinkled with some irregular protractive threads. Last whorl 
descending rather deeply. Peristome expanded, the edge of 
parietal callus usually distinct. Alt. 15.3, diam. 26.5 mm.; 
5 whorls. Mustang Range. Albinos were taken at Station 284, 
Sonorella montezuma, n. sp. The shell is small, narrowly 
umbilicate, cinnamon, fading to nearly white on the base and 
on both sides of the chestnut-brown band. Embryonic whorls 
without protractive threads. Peristome slightly expanded, 
Alt. 9.4, diam. 15 mm.; 43 whorls. Montezuma Canyon, 
Huachuca Mts. It is smaller than any known Huachucan 
species except S. g. parva, which inhabits the opposite end of 
the range. 
Sonorella elizabethae, n. sp. Shell dilute cinnamon-buff fading 
on the base and on both sides of the narrow chestnut-brown 
band. Embryonic whorl having numerous, irregular portrac- 
tive threads; later whorls microscopically lineolate-granulose. 
Aperture small, the peristome slightly expanded. Alt. 10.7, 
diam. 19.2, umbilicus 3.2mm. Canillo Hills. 
Sonorella cotis, n. sp. Shell dilute cimnamon-buff fading on 
base and on both sides of the chestnut-brown band. Embry- 
onic whorls with weak protractive threads. Last whorl rather 
deeply descending in front. Peristome somewhat expanded, 
edge of the parietal callus distinct. Alt. 12.3, diam. 20, um- 
