Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/23

 A larger topotype measures, height 15.7 mm., diameter 25.7 mm., aper- ture 13.2 x 15 mm., 4J whorls. Other topotypes are from 20.2 to 26 mm. diameter.

Fig. 166. Sonorella sabinoensis hesterna, type.

Arizona: Southern foothills of the Rincon Mountains south of the Tueson-Benson highway, at Shaw's goat ranch, near the cave (J. H. Ferriss), Type 119489 A.N.S.P.

This form was evidently abundant, as Ferriss sent me 61 " bones ", only a few in good condition, none alive. The station is an extremely arid one.

Its place in the series remains uncertain.

(Hesternus, of yesterday.)

Sonorella sabinoensis tucsonica Pilsbry & Ferriss Fig. 167 a-c.

Sonorella sabinoensis tuesonica Pilsbry & Ferriss, 1923, Proc. Acad. Nat. Sci. Phila., 75: 69. text-fig. 2a, e-e.

Sonorella sabinoensis deflecta Pilsbry & Ferriss, 1923, Proc. Acad. Nat. Sci. Phila., 75:71. text-fig. 2b.

The shell is similar to S. sabinoensis except that the umbilicus is a little larger in specimens of equal size; as in that species, the last whorl, seen from above, is quite wide. It differs from S. papagorum by the sculpture of the embryonic whorls, which is distinct, as in sabinoensis, while in papagorum it is extremely weak, the surface appearing more polished. The color is distinctly darker than papagorum, wood-brown or almost fawn color, with a usually broad chestnut-brown band with pale borders. The last whorl descends very little in front.

Height 16 mm., diameter 27.3 mm.; 4-2/3 whorls. Type. Station 81.

Height 13 mm., diameter 20.8 mm.; 4-1/2 whorls. Station 64.

Fig. 167. a. Sonorella sabinoensis tuesonica, type. b. c, form deflecta.

The genitalia are similar to S. sabinoensis, characterized by a rather long penis, in those measured from slightly over 1/3 to nearly 1/2 the diameter of shell. The slender, slightly tapering verge is also long, generally wrinkled

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