THE NAUTILUS. 19 
NEW LAND SNAILS COLLECTED BY THE FERRISS AND HINKLEY 
EXPEDITIUN OF 1919. 
BY H. A. PILSBRY AND JAS. H. FERRISS. 
Sonorella montana. Resembling S. walkeri in form. Umbili- 
cus one-eighth to one-tenth the diameter. Embryonic whorls 
densely granulose with rather sparse protractive threads, the 
next whorl indistinctly granose, later whorls very smooth. 
Aperture large, the outer margin expanded, basal somewhat re- 
flected. Anatomically it is distinguished by the extremely 
short and slender penis, smaller than in any other species ex- 
amined. Montana Peak, near the Montana mine, not far from 
Oro Blanco, and Bear canyon, further southeast, Pajarito range. 
Alt. 14, diam. 23.7, umbilicus 3 mm.; 4? whorls. 
Alt. 16.3, diam. 25.5, umbilicus 2.6 mm.; 5 whorls. 
Sonorella hinkleyi, n. sp. The shell is small, depressed, solid, 
umbilicus about one-sixth the diameter. Embryonic shell 
radially rugose with sparse, irregular divaricating threads, later 
whorls slightly striate. Peristome very little expanded. A 
dark band is normally present, but at Station 244 albinos were 
found in abundance. Alt. 8.5, diam. 16 mm.; 4} whorls. 
Cayetano Mountains. Anatomically characterized by the long 
penis and vagina, the latter with a weakly marked muscular 
dilation. Papilla spirally plicate. 
Sonorella cayetanensis, n. sp. Shell thin, light, the band pale- 
bordered above and below, umbilicus contained about 8 times 
in the diameter. Embryonic sculpture about as in S. hinkleyi, 
the later whorls polished, faintly striate. Peristome thin, little 
expanded. Alt. 11.7, diam. 21 mm.; 4? whorls. A thinner, 
larger, more capacious shell than S. hinkleyi, resembling it con- 
siderably in soft anatomy. Highest peaks of the Cayetano 
Mountains. 
Sonorella tumacacori, n. sp. Except by its larger size, the 
shell is similar to S. hinkle,i. The genitalia differ by the larger 
node on the vagina, the more tapering penis-papilla and the 
very short penial retractor muscle. Alt. 10.4, diam. 17.8mm.; 
44 whorls. Stations 209, 210, in a large gulch draining the 
northeastern side of Tumacacori Peak. 
