A ND Cer ee 
1923] NATURAL SCIENCES OF PHILADELPHIA 65 
ce’. Vagina not much longer than the penis, often shorter. 
Group of S. ambigua. 
b’. Penis slender, the papilla slender, gradually tapering to the 
distal end. Group of S. hachitana. 
Group of S. hachitana. 
Sonorella hachitana (Dall) 
A series of 21 specimens in the National Museum, no. 130005, is 
from the top of two peaks of the Carrizalillo Hills, near Carrizalillo 
Spring, New Mexico, collected by Dr. Mearns when on the Inter- 
national Boundary Survey. They have the deeply descending last 
whorl of hachitana, and differ from that species in little except the 
smaller size, from 18.5 to 21 mm. diameter. It is apparently a 
small local form of hachitana, and of interest because it is at the 
eastern limit of the genus as now known. 
Sonorella elizabethe Pils. & Ferr. Plate I, fig. 1; plate IV, figs. 1, la. 
Nantilus vol. 33, July 1919, p. 20. 
Canelo Hills: Station 276, a large peak east of the Huachuca- 
Duquesne road. Type no. A. N.S. P. 
Closely related to S. hachitana, but the shell is constantly smaller 
and the male organs longer. The penis is decidedly over one- 
third the diameter of shell and longer than the vagina (in hachitana 
between one-third and one-fourth the diameter of shell, and shorter 
than vagina). It is very slender, with a short, stout basal sheath. 
Penis-papilla slender, tapering, over half the length of penis. 
Flagellum minute. The organs in two specimens from Station 276 
measure. 
1 2 TUE a 8.0 mm. Epiphallus....5.5 and 6 mm. 
Penis-papilla........ 5.0 mm. Were aisee: hope eet iors 6.0 mm. 
The shells vary in diameter from 16.7 to 20.7 mm. 
Sonorella mustang Pils. & Ferr. Plate I, figs. 2; plate IV, figs. 5. 
Nautilus vol. 33, July, 1919, p. 20. 
Mustang Mountains, on the Pima-Cochise Co. line, at Stations 
153, 155-159 (1918), and 284, 286, 332-334, 336 (1919). Type 
from Station 332 (1919). 
The shell resembles S. hachitana closely, differing by being slightly 
less depressed, the umbilicus somewhat smaller, the last whorl 
descending less in front, and the aperture larger. 
[t is glossy, light pinkish cinnamon, fading to whitish around the 
umbilicus and on both sides of the chestnut-brown band above 
the periphery, which is visible above the suture on 11% to 2 whorls. 
The first whorl has minute, irregular, radial wrinkles partly anas- 
