72 PROCEEDINGS OF THE ACADEMY OF [Feb., 
Measurements of the genitalia in millimeters. 
| | 
3 os} : 
al . O43 a = S) 
EB We aes MPEP kc en 
§ 8 a | 3 a | 89 | ge] 3 3 
Ay Ay ie2) is > | nw 1 Ay A = 
DS PASeRDULLES, «2% .3s-.-:l ADO» i iDA rl AAG al crea Bei ile nee 655) 19 | 94,335 
2 ues nce en 305) 29. 519) OF 126-5)" -B1:| 6) 2) yacaee 
3 “ 1S SARS ND 2 Oh Mea eta oe ee 19.5 79,622 
4. ce RE MPR ee ha 25 Dom She ceae 15) oe. pes 22 | 97,409 
5. OFS ee da a eee ee bees pager. Led eon | 22 | 97,409 
6. OS Oat ae ce SO ee eee (uieies| ete eee Ree | 19 | 97,408 
Fc WS De LORCUTO cdots 20.3 iLiag pees | Le ORO lg ie Ne eek | 21° -/.94:331 
8. areas POS RSIP OR We Oi-4 | <0 6eheie Ps o meet (23 99,682 
9 eee anh 25 eA 2119.7) 006155. | 25 Wace 19 99,681 
The specimens measured are from the following localities: 
1. South Fork of Cave Creek. 
2. Foot of Reed’s Mountain, Cave Creek. 
3. Rucker Canyon (?). Original type of S. virilis. 
4,5. Head of Rucker Canyon. 
6. Rucker Canyon at mouth of Raspberry Gulch. 
7. White Tail Canyon, Station 4. 
8. White Tail Canyon, Station 14. 
9. White Tail Canyon, Station 00. 
Sonorella virilis leucura subsp. noy. PI. II, figs. 7-9. 
The shell is decidedly more depressed than S. virilis or S. v. “cireum- 
striata,” though the spire is about equally convex; the umbilicus is 
wider; the aperture is smaller, and the ground-color is paler, sub- 
opaque, whitish, tinted more or less with brown, nearly white on each 
side of the dark band, and pale around the umbilicus. 
Embryonic and neanic stages—There are 132 embryonic whorls. 
The depressed tip is smoothish, followed by only a few radial wrinkles ; 
following embryonic whorl is roughened with low granules lengthened 
in a radial direction, or short, irregularly waved or vermiculate radial 
wrinkles; over these there is a pattern of grains in regular squares at 
first, but soon forming protractive rows, the grains becoming indis- 
tinct. On the first post-nepionic whorl the fine striae are more or less 
interrupted or minutely indented in places. The post-nepionie whorls 
as far as the fourth whorl are clothed with very short deciduous hairs, 
so delicate that the slightest attempt to clean the shell removes them, 
