Page:Land Mollusca of North America (north of Mexico) Vol. I Part 1 277-end.pdf/20

 Height 14.5 mm., diameter 26 mm. Largest.

Height 13.2 mm., diameter 25 mm. Most depressed.

Height 16.4 mm., diameter 24.8 mm. Most elevated.

Height 12.2 mm., 20 mm. Smallest.

Figures 164 e and e' are depressed and elevated shells from Bear Canyon.

Shells from the type station measure from 20 to 24 mm. diameter. The relative size of the aperture also varies within rather wide limits. In the type specimen (Fig. 164 b) the width of aperture is contained about 1.63 times in that of the shell, and in another locotype (Fig. 164 c) it is contained nearly 1.8 times. In the small-mouthed individuals the umbilicus is somewhat larger and less covered, and the last whorl, viewed from above, is not so wide. Nearly every station supplied individuals with large, intermediate and small apertures.

The specimens from low in Sabino Canyon usually have more solid, thicker shells than those from higher; but this is not always the case.

Sonorella sabinoensis buehmanensis Pilsbry & Ferriss Fig. 164 g. h.

Sonorella sabinoensis buehmanensis Pilsbry & Ferriss, 1919, Proc. Acad. Nat. Sci. for Phila., for 1918. p. 292, pl. 5, figs. 2-3b; text-fig. 5.

Typically the shell differs from S. sabinoensis by being more solid and more elevated, only very slightly paler near the shoulder band, and with nearly one whorl more in examples of the same diameter. Umbilicus contained 8 times in the diameter. Penis rather slender throughout (Fig. 165 c, d).

Height 16.4 mm., diameter 25.8 mm.; 5-1/3 whorls. Type (Fig. 164 h).

Height 17 mm., diameter 25.2 mm.; 5-1/4 whorls. Topotype.

Height 15.7 mm., diameter 23 mm.; 5__ whorls. Topotype.

Height 17.7 mm., diameter 25.8 mm.; 5 whorls. Station 43.

Height 13.7 mm., diameter 21.5 mm.; 4-3/4 whorls. Station 43.

Height 13 mm., diameter 21 mm.; 4-2/3 whorls. Station 43.

Arizona: Buehman Canyon, in the eastern part of the Santa Catalina Mountains, the Type 109198 A.N.S.P., from Station 44 (1913), near the Korn Kobb mine. Also at Stations 41. head of Sycamore Gulch, tributary to Buehman Canyon, 42, Buehman Canyon at the Brush Corral, and Station 43, Buehman Canyon a mile below the Brush Corral Ranger Station (J. H. Ferriss).

There is considerable variation in the shells from Buehman Canyon, in size, degree of elevation and number of whorls. Specimens from the head of Sycamore Gulch have the umbilicus slightly more open than in typical buehmanensis, and the borders of the shoulder-band are paler; thus approaching the larger forms of S. sabinoensis. In Stations 42 and 43 the size varies widely, and the smaller specimens have only a fraction of a whorl more than sabinoensis, from which they differ by the smaller aperture.

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