Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/26

 last whorl is wide and descends somewhat in front. The peristome is narrowly expanded. The parietal callus usually has a thickened edge in fully adult shells.

Height 16.7 mm., diameter 27.5 mm.; nearly 5 whorls. Type (Fig. 169 a).

Height 16.3 mm., diameter 25.2 mm.; 5 whorls. Topotype (Fig. 169 b).

Genitalia (Fig. 170). The general proportions are as in S. marmorarius. The penis has a long, very thin sheath about the basal part, not seen in marmorarius; its lower portion is somewhat swollen and has several small longitudinal folds within. Retractor muscle long. Verge weakly annulate, about half as long as the penis. There is the usual short flagellum. The vagina about equals the penis in length. Length of penis 10 mm., verge 5, epiphallus 7, flagellum 1.5, vagina 9 mm.

Arizona: Galiuro Mountains, Graham County, on the southern slope of the mountains at John Rhodes' Ranch and Rhodes Canyon; Whitlock Ranch; Copper Creek to Table Mountain. Type 119493 A.N.S.P., from a porphyry slide l i miles south of Copper Creek mining camp. Also in Gila and Pinal Counties (J. H. Ferriss).

Fig. 170. a. a, Sonorella galiurensis, Nantes Mts. n. b, S. galiurensis superioris. c, c, S. galiurensis, Picket Post Mt. d, d, Galiuro Mts. Scale lines = 1 mm.

This form is much like S. marmorarius, but the shell is decidedly more capacious and darker colored, with a larger aperture and a smaller umbilicus. Its habitat is at a lower elevation and separated from that of marmorarius

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