228 PROCEEDINGS OF THE ACADEMY OF [Mch., 



This is the senior name for a member of the group of closely related 

 forms inhabiting the Sierra Blanca and adjoining Sacramento Moun- 

 tains, in middle-southern New Mexico. 



The shell is more globose than any other known Ashmunella, having 

 about the proportions of the large Eastern Mesodons. It is dull and 

 roughly sculptured on the last whorl with coarse, curved irregular 

 wrinkles, between and over which fine incised spirals may be traced. 

 The rather small aperture is contracted by a wide, heavy lip, the outer 

 margin of which is indistinctly thickened within. There is a low, in- 

 distinct basal tooth or callous, and a very small, deeply placed, oblique 

 parietal tooth, sometimes absent. The innbilicus is narrow and deep, 

 but slightly enlarging at the last whorl. Whorls 5-^-. 



Alt. 10, diam.17 mm. 



Ashmunella rhyssa miorhyssa (ball), pi. xil. fi};!=. 5. 6. 



Pohjgyramiorhys.sa Dall, Nautilus, XII, p. 75, November, 1898. 

 Ashmunella rhyssa miorh/ssa (Dall), Pils and Ckll., Proc. Acad. Nat. Sci. 



Phila., 1899, p. 193, figs. 1-3 on p. 189 (genitalia, jaw and teeth) ; Pilsbry, 



Proc. Acad. Nat. Sci. Phila., 1900, p. 108 (anatomy). 



This form differs from .4. rhyssa chiefly in being smoother, the coarse 

 wrinkles of that being reduced to stria. The umbilicus is a little more 

 open at the last whorl. In other respects there are no constant or even 

 prevalent differences. 



Alt. 9, diam. 16 mm. Sierra Blanca (Ashmun). 



Alt. 9, diam. 15.5 mm. Sierra Blanca (Ashmun). 



Alt. 10.6, diam. 16.8 mm., whorls 6 ) 



Alt. 9.9, diam. 16 mm., whorls 5.^. > ^'^-^f ^'^^^^ creek Sierra 



A14- ino T 1/- 1 1 -•?' I Blanca (Townsend). 



Alt. 10.3, diam. 16 mm., whorls of. J 



Sierra Blanca, Lincoln county, New Mexico (E. H. Ashmun). 

 Near Eagle creek (C. H. T. Townsend). 

 Ashmunella rhyssa hyporhyssa (Ckll.). PI. XII, figs. 7-13. 



Polygyra r. hyporhysm. C'kll.. Nautilus, XII, November, 1898, p. 77. 



Ashmunella hyporhyssa (Ckll.) var. edentata, with mut. rufescens and alba, 

 Ckll., Nautilus, XIV, p. 72, October, 19f)0 (Cloudcrof t) . 



A.r. hyporhyssa Ckll.. Vanatta, Nautilus, XVI, p. 58, September, 1902 (High- 

 rolls and Cloudcroft) : Pilsbry, Proc. Acad. Nat. Sci. Phila., 1900, p. 108, 

 fig. 1 (genitalia of Cloudcroft specimen). 



