1915.] NATURAL SCIENCES OF PHILADELPHIA. 327 
are Oviparous—a further character distinguishing them from Oreo- 
helix, which is viviparous. It is also a more primitive feature. 
Sonorella hachitana (Dall). Plate V, figs. 4, 4a, 4b. 
Epiphragmophora hachitana Dall, Proe. U. 8. Nat. Mus., XVIII, p. 2, 1895; 
XIX, p. 338, 1896. 
Sonorella hachitana (Dall), Pilsbry, Proc. A. N. 8. Phila. for 1900, p. 556, 
1901; 1905, p. 257 (in part). 
Sonorella hachitana (Dall), Bartsch, Smithsonian Misc. Coll., vol. 47, p. 
190, Pl. 31, fig. 2 (shell of type); Pl. 29 (apex), 1904. 
As this species is type of the genus Sonorella,> the investigation 
of its soft anatomy had become a matter of importance, and to 
obtain living material was one of the chief objects of our quest in 
the Hachetas. 
We found it at Stations 7,8, 10 and 11. All of these stations are 
near or on Dr. Mearns’s route to the summit of Hacheta Grande. 
Station 7, on the western slope of a hill at the head of the northern 
branch of Western Canyon, was the most prolific locality. Here 
the Sonorellas may be found in some numbers under large stones 
on the steep slope near the hill-top, where there is some shade from 
the pion pines. 
Twenty-one adult shells from this station measure as follows: 
| SU ANSI 00) 6 ¢ eae ie} 22 22 23 Zo 24 
Number of shells.......................... 2 8 2 2 1 1 
The shells vary somewhat in the degree of deflection of the last — 
whorl, but very little in other respects. The last whorl descends 
more than in most related species. The color is pale fawn, fading 
to whitish in the middle of the base, and having a cinnamon-brown, 
shading into chestnut-brown, band above the periphery; this band 
is bordered with white on both sides. The aperture is rather small, 
its greatest diameter (including peristome) being 50 to 54 per cent. 
of the diameter of the shell. 
At Station 8 only dead shells were found, but these are more 
variable in size, the extremes in a lot of 8 measuring: 
Alt. 13.5, diam. 25.5 mm.; aperture diam. 13.6 mm. 
6c ial a3 91.3 ce ce ce 10.8 ce 
5 Epiphragmophora hachitana Dall was originally designated as the type of 
Sonorella, but the soft anatomy of the genus was described from New Mexican 
specimens of what was subsequently determined as a small form of S. ashumni 
Bartsch, a species which at that time had not been discriminated from S. hachi- 
tana. The dissection of topotypes of hachitana shows that the New Mexican 
form is specifically distinct, though closely allied. 
