of penis about 9 mm., verge 5.5 mm., epiphallus 8.5 mm.,1 vagina 8 mm. There is no flagellum, and no penial retractor was seen.
Fig. 154. Sonorella huachucana aguacalientensis, upper figures, type; lower figures. from lowest station.
Arizona: Western foot of Santa Rita Mountains in the mouth of Agua Caliente Canyon, from about 3800 to 4200 feet (Ferriss, Pilsbry and Daniels), Type and paratypes 112162 A.N.S.P.
Our Station 1 is in rocks on the bank of the wash running out of the canyon, immediately southeast of the fine spring of tepid water which gives this canyon its name. This is the lowest station for any snail found in these mountains, the elevation being about 3,800 feet. The shells measure 19 to 24 mm. in diameter and live in crevices or under fragments of a friable, shale- like rhyolite, of a dark vinaceous-drab color. See Figure 154, lower figures.
Station 2, the type locality, is at the base of bluffs southeast of Station 1 and at 4,100 to 4,200 feet (Figs. 154, upper). The diameter runs from 22.3 to 24 mm.
Fig 155. Genitalia of S. h. aguacalientensis, type,
with detail of verge (pp.). epi., epiphallus; p, penis;
vag., vagina; v.d., vas deferens.
1 Perhaps part of the duct measured as epiphallus is really an enlarged portion of the vas deferens, as in huachucana. A vestigeal flagellum may be present, bound into the integument with the beginning of the vas deferens, to be revealed by sections.
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