Other specimens of the original lot from the type locality measure:
Height 15 mm., diameter 26.3 mm. Height 13.8 mm., diameter 24 mm.
Height 15.3 mm., diameter 24.6 mm. Height 13.8 mm., diameter 23 mm.
Height 13 mm., diameter 23.6 mm. Height 12.5 mm., diameter 22 mm.
The largest examples were taken at Station 3, two measuring:
Height 16.4 mm., diameter 28.2 mm.; 5 whorls.
Height 17 mm., diameter 28 mm.; 5 whorls.
Marble Peak and Apache Camp have oak, juniper and sycamore wood on the lower slopes; the crest of the ridge, the head of the main slide, is in the pine belt.
Fig. 161. Genitalia of Sonorella marmorarius. a. No. 109,077; b. c, No. 109,071; d, No. 109,039; e, No. 109,083; f, No. 109,084; c, No. 109,078.
The name imula (Figs. 160 b, c) was given to specimens from a limestone hill 6 miles west of Brush Corral Ranger Station, north of Alder Springs, in the northern foothills of the Santa Catalinas. They differ from marmorarius by the somewhat darker color, and by having about a half whorl more in shells of the same diameter. The type (Fig. 160 b), is the largest shell seen; it measures height 15.6 mm., diameter 26.7 mm.; 5-1/3 whorls. In 84 adult shells from one station the diameters run from 22.3 mm. to 26.5 mm.; 41 are from 24 to 25 mm. A specimen having the umbilicus exceptionally narrow is illustrated in Figure 160 c; diameter 24.4 mm., 4-1/2 whorls. On going over the whole series again, it appears that the
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