THE NAUTILUS. 19 



NEW LAND SNAILS COLLECTED BY THE FERRISS AND HINKLEY 



EXPEDITION 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.; 4f 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.; 4f 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. hinkleyi. 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.; 

 4^ whorls. Stations 209, 210, in a large gulch draining the 

 northeastern side of Tumacacori Peak. 



