Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/13



In the Pajarito Mountains, which extend over the Mexican border west of Nogales, Ferriss and A. A. Hinkley found a Sonorella which we named montana. The shell is not distinguishable from S. h. walkeri or S. h. patagonica, in different specimens. The male organs are a little smaller than in walkeri, but I think not significantly different. The penis is extremely small, having a short, stout basal sheath and long retractor muscle. The flagellum is reduced to a mere bud; beyond it the vas deferens is enlarged. The base of the vagina is enlarged. Length of penis 2.5 mm., verge 1.3 mm., epiphallus 5 mm., vagina 9.4 mm. (Fig. 159). The preserved animal is nearly white. The shells were taken on Montana Peak, near the mine of the same name, in Bear Canyon in Bear Valley, and in the pass, on the highway to Oro Blanco. The type of montana is 43724 A.N.S.P., from the first locality.

(Named for Dr. Bryant Walker.)

Sonorella marmorarius Pilsbry & Ferriss Fig. 160 a-c.

Sonorella marmorarius Pilsbry & Ferriss. 1919, Proc. Acad. Nat. Sci. Phila. for 1918, p. 294. pl. 3, figs. 9-9b; text-fig. 6.

Sonorella marmorarius imula Pilsbry & Ferriss, 1919. Proc. Acad. Nat. Sci. Phila. for 1918, p. 297, pl. 3, figs. 7, 7a, 8-8b.

The shell is depressed, rather solid, umbilicate, the width of umbilicus contained about 7 times in that of the shell, suddenly widening at the last whorl; light pinkish cinnamon, paler around the umbilicus, and whitish on both sides of the chestnut-brown band above the periphery. The surface is glossy. Embryonic shell of l-1/2 whorls, the last of which is densely, irregularly granular, with indistinct protractive and retractive threads (when unworn), subsequent whorls delicately marked with growth-lines, and under the lens showing some weak spiral impressed lines in places on the upper surface of the last whorl. The suture descends rather deeply in front. Aperture is quite oblique, oval. Peristome expanded throughout, with a gray edge, somewhat thickened within, the margins generally connected by a roughened callous ridge in fully adult shells.

Height 13.7 mm., diameter 25 mm.; 4-3/4 whorls.

Genitalia (Fig. 161 a-g). The penis is thin-walled, very weakly or usually not noticeably enlarged near the atrium, containing a slender tapering, corrugated verge, half to two-thirds or more the length of penis. Epiphallus somewhat shorter than penis, typically terminating in a little flagellum, but this is often rudimentary or wanting. Penial retractor long, inserted on apex of penis and base of epiphallus. The vagina is but little shorter than the penis. Lengths of the organs in mm. follow, the specimens all from stations on Marble Peak:

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