1905.] NATURAL SCIENCES OF PHILADELPHIA. 259 
very oblique and unusually long in the inner marginals. This radula 
differs a good deal from that of the Purtyman’s ranch form, in both 
count of the teeth and in some details of their shape; but these features 
are admitted by all who have examined many radule to vary so widely 
among individuals that their value is largely discounted. The dis- 
erepancy between the forms should be controlled by the examination 
of several of each form. 
Sonorella hachitana ashmuni Bartsch. Pl. XVII, figs. 9-14. 
Sonorella hachitana, specimens from Oak creek, Purtyman’s, Arizona, Pils- 
bry, Proc. Acad. Nat. Sci. Phila., 1900, p. 557, Pl. 21, figs. 1-5 (anatomy). 
Sonorella ashmuni Bartsch, Smiths. Mise. Coll., Vol. 47, p. 190, Pl. 31, fig. 5 
(1904). 
_Purtyman’s ranch, on Oak creek, 40 miles from Jerome, in the cast- 
ern edge of Yavapai county, Arizona. Collected by Rev. E. H. Ash- 
mun, 1900 (No. 79,409, A. N.S. P.). 
These specimens furnished the anatomical preparations described 
by me (Proc. Acad. Nat. Sci. Phila., 1900, p. 557, Pl. X-XI, figs. 1-5). 
Specimens of this lot have been examined by Mr. Bartsch and pro- 
nounced by him to be “a small race of S. ashmunt. They bear the 
same relation to ashmuni that S. mearnsi bears to S. dalli.”” I would 
prefer to make an immaterial change in this statement. I would say 
that S. ashmuni represents a large race or colony of S. hachitana, and 
the Oak creek lot is nearly typical hachitana. 
The specimens are well-developed shells, often larger than typical 
hachitana from Hacheta Grande Mountains. Nearly all are banded, 
whitish above and below the band; but 3 out of 350 collected by 
Mr. Ashmun at this place lack the dark band (figs. 138, 14). Speci- 
mens measure: 
Specimens: a b c (hachitana) d e ij 
Alt. 13 PEAY 13.5 ((ts.o. 02°) Ise “is 13 mm. 
Diam. 23 Boe!) eh M22. (22.2)' Ban zo 2a 
Alt..apert. 10.7 10 POSE CRO 9.0) OR) Ts OS 
Mam vapert. 12.9 105) 11.7 (G19 Loz) 16.7 12 ly Ropes 
Compare with the measurements in parentheses of topotypes of 
hachitana, part of the original lot, received from Dall. 
In general the aperture in the Purtyman ranch shells averages larger 
than in typical hachitana, but no hard and fast line can be drawn, and 
selected individual specimens of each are simply indistinguishable, 
either by measurements, color or any other character. The most we 
can claim for S. ashmunt is the rank of a weakly differentiated local race 
of S. hachitana, chiefly separable in actual practice by its geographic 
