Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/4

 threads on the outer part, and irregularly ascending on the inner, their intervals finely wrinkled. Traces of papillae are visible on the post- embryonic whorl or whorls; on the last whorl minute growth wrinkles, and under the microscope or a strong hand-lens weak, impressed spiral lines are visible on the upper surface (but are wanting in some examples ). It descends rather steeply to the aperture. Peristome expanded, brown-edged.

Fig. 150. Sonorella huachucana, Patagonia Mountains.

Height 12.7 mm., diameter 22 mm.; 4-3/4 whorls. Type of patagonica.

Height 15.3 mm., diameter 23.7 mm.; 4-3/4 whorls. Topotype.

Height 11.4 mm., diameter 18.5 mm.; 4-1/2 whorls. Topotype.

In one specimen (Fig. 150: 9), the dark band is nearly 3 mm. wide, the only case of such variation noticed in the genus.

Penis slender, nearly half the diameter of shell, with a basal sheath, and containing a slender, tapering verge which is usually more or less wrinkled in the alcoholic preparations. Lower part of the vas deferens is somewhat enlarged. Measurements of 7 specimens follow, the first column from the type specimen of patagonica.

Penis 8.7 9.3 8.5 7.0 7.0 6.5 6.5 mm.

Verge 6.0 6.3 ... 5.0 5.5 ... 5.5 mm.

Epiphallus 8.0 7.8 ... 8.5 ... 6.5 5.7 mm.

Flagellum 0.5 0.5 1.0 minute ... 0.7 1.0 mm.

Vagina 9.0 11.0 8.5 8.0 8.0 8.0 7.5 mm.

It is a common snail in the Patagonia Mountains around Washington and Duquesne, Santa Cruz County. The type of S. patagonica is 43722 A.N.S.P., from main canyon of Mt. Washington running west, under bowlders (Ferriss).

Sonorella huachucana cotis Pilsbry & Ferriss Fig. 152.

Sonorella cotis Pilsbry & Ferriss, 1919. Nautilus. 33: 20: 1923. Proc. Acad. Nat. Sci. Phila., 75: 66, pl. 1, figs. 5, 6; pl. 4, figs. 3. 9.

The shell is dilute cinnamon-buff, fading on the base and on both sides of the chestnut-brown band; glossy. Embryonic whorls with weak

Fig. 151. 1, 1a. Sonorella huachucana elizabethae, Canelo Hills. 2, 4, 6-8. S. huachucana. Patagonia Mts. 3, 9, S. h. cotis. Whetstone Mts. 5, S. h. mustang, Mustang Mts. Scale lines = 1 mm.

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