294 PROCEEDINGS OF THE ACADEMY OF [Nov.—Dec., 
Sonorella hesternan.sp. Pl. IV, figs. 6, 6a, 6b. 
A long series of dead shells was taken at Station 148 (1917) in a 
rock slide on the south side of the Tucson-Benson highway, near the 
cave on Shaw’s ranch, southern foothills of the Rincons, at about 
3,500 feet. They are smaller and more solid than S. rinconensis, 
and the umbilicus is somewhat smaller. It is more depressed and 
has a wider umbilicus than S. sabinoensis. In color and surface it 
resembles the latter species. The freshest shells are between cinnamon 
and tawny-olive, fading around the umbilicus, white on both sides of 
the chestnut-brown band. The suture descends rather abruptly to 
the aperture, but not quite so deeply as in S. hachitana. 
Alt. 13.5, diam. 22.4 mm. (type). 
pate ©: fy Oh ae ee 
In a series of 37 adult examples, the smallest measures 20.1 mm. 
in diameter, the largest 25.9 mm. They run as follows: 
Diam. 20-20.9 mm., 4 specimens. 
LO. eam = 
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en Dt A. 
Cn A Boe 1S 2 f 
The station is an extremely arid one. It is a true desert Sonorella. 
The status of the form is uncertain, but it can scarcely be linked with 
any of the Santa Catalina or Rincon species, so that, while we do 
not like to describe a Sonorella without examination of the soft 
anatomy, there seems nothing else to do in this case. Its status 
may be revised when living examples come to hand. 
Sonorella marmorarius n. sp. PI. III, figs. 9, 9a, 96. 
The shell is depressed, rather solid, umbilicate (the width of um- 
bilicus contained about 7 times in that of the shell, suddenly widening 
at the last whorl to about double its former width); 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 114 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 plaees 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. 
