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 radulse to vary so widely 

 among individuals that their value is largely discounted. The dis- 

 crepancy between the forms should be controlled by the examination 

 of several of each form. 

 Sonorella hachitana ashmuni Bartsch. PI. XVII, figs. 9-14. • 



Sonorella hachitana, specimens from Oak creek, Purtyman's, Arizona, Pils- 



bry, Proc. Acad. Nat. Sci. Phila., 1900, p. .5.57, PL 21, figs. 1-5 (anatomy). 

 Sonorella ashmuni Bartsch, Smiths. Misc. Coll., Vol. 47, p. 190, PI. 31, fig. 5 



(1904). 



Purtyman's ranch, on Oak creek, 40 miles from Jerome, in the east- 

 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 XXI, 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. ashmuni. 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. 13, 14). Speci- 

 mens measure: 



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 tj^pical 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'. ashmuni is the rank of a weakly differentiated local race 

 of S. hachitana, chiefly separable in actual practice by its geographic 



