Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/2



Texas: Sierra Blanca Peak, El Paso County (Ferriss, 1925).

Fig. 147. Sonorella hachitana orientis, type and paratype.

Fig. 148. Same, genitalia.

In shells from Dripping Spring the umbilicus is contained 6-1/2 times in the diameter; in those from Ropes Spring, 7 times. It is smallest in the single shell seen from Filmore Canyon, 7-2/3 times in diameter. In both localities the snails were found late in September aestivating rather deep under stones. This is the only Sonorella found east of the Rio Grande.

The shells from Sierra Blanca Peak, Texas, run from 22 to 24 mm. in diameter, and resemble those of the Organ Mountains closely in form. None have been dissected. This mountain, about a hundred miles southeast of the type locality of orientis, is the eastern outpost of Sonorella.

[Orientis, of the east.)

Sonorella huachucana Pilsbry Figs. 149, 150.

Sonorella virilis huachucana Pilsbry, 1909. Proc. Acad. Nat. Sci. Phila. p. 267. pl. 17, fig. 24.

Sonorella huachucana Pilsbry & Ferriss, 1909. Proc. Acad. Nat. Sci. Phila., p. 498. pl. 19, figs. 16, 17.

Sonorella patagonica Pilsbry & Ferriss. 1919. Nautilus. 33:20: 1923. Proc. Acad. Nat. Sci. Phila. 75: 67. pl. 1, figs. 7-10; pl. 4, figs. 2, 4, 6-8.

Shell less depressed than S. hachitana, with much smaller umbilicus contained slightly more than 8 times in the diameter; more elevated than S. virilis, which also is more widely umbilicate; glossy, thin; weakly striate; embryonic sculpture of the hachitana type; second and third whorls with weak traces of spaced papillae; the top of the last whorl shows numerous very weak spiral impressed lines. The supraperipheral band is rather wide and dark, with distinct white or whitish bands both above and below it. Above the upper white band the surface is pale reddish to the white sutural line. Below the lower white border the same reddish color prevails, but gradually fades on the base to whitish

Fig. 149. Sonorella huachucana, type.

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