Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/28

 Sonorella verdensis new species Fig. 171 a, b, c.

The shell resembles S. ambigua and S. galiurensis in form and coloration, but the chestnut-brown band above the periphery is without the white borders which arc quite conspicuous in S. galiurensis, though the ground color may be slightly paler there. After the minute smooth initial tip the embryonic whorls have close, fine radial wrinkling, more or less interrupted or anastomosing, but no diagonally descending threads as in the hachitana group. The first neanie whorl is not papillose. The umbilicus is larger than in S. galiurensis superioris.

Fig. 171- Sonorella verdensis; a, type; b, c. Pine creek, d, e. Sonorella galiurensis superioris, type and paratype.

Height 16 mm., diameter 27 mm., aperture 13 x 14.6 mm.; 5 whorls.

Genitalia (Fig. 172). The penis is very long, nearly equaling the diameter of shell, with a short basal sheath; containing a large, cylindric verge with blunt end (and in the type, longitudinally wrinkled near the end, left figure ). Epiphallus enlarged in the basal 3 mm., where penial retractor attaches. Flagellum moderately developed. Vagina not quite as long as penis. The hermaphrodite duct is large and strongly convoluted. Length of penis 25. verge 17, epiphallus 14, flagellum 0.8, vagina 19 mm.

Arizona: Mazatzal Mountains, Gila County, on the Maricopa County border (J. H. Ferriss), Type 130859 A.N.S.P. Pine Creek Natural Bridge, Gila County (Ferriss and Hand).

By the shell alone this species is separable from S. galiurensis by the absence of diagonal threads on the embryonic whorls whorls.

Fig. 172. S. verdensis.

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