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. 13, diam. 

 22 mm. ; nearly 5 whorls. It is often larger. Mt. Washington, 

 Patagonia Mts. 



Bulimulus nigromontanm, n. subsp. Differs from B. uigro- 

 montamis 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 pro tractive threads. Last whorl 

 descending rather deeply. Peristome expanded, the edge of 

 parietal callus usually distinct. Alt. 15.3, diam. 26.5mm.; 

 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.; 4 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 3.2 mm. Canillo Hills. 



Sonorella cotis, n. sp. Shell dilute cinnamon-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- 



