232 PROCEEDINGS OF THE ACADEMY OF [Mch., 
There is a faint, hardly noticeable basal prominence, but nothing to 
be called a tooth. There is no parictal tooth, and the callous between 
the lip-ends is very thin. 
Alt. 5.5, diam. 11 mm. 
Sierra Blanca, on the highest summit, three found under a rock, 
elevation 11,092 feet (C. H. T. Townsend). 
One of the co-types of this very distinct form is figured, No. 73,558, 
sc a Se 
Ashmunella pseudodonta (Dall). Pl. XIU, figs. 15, 16, 17, 18. 
Polygyra pseudodonta Dall, Proc. U.S. Nat. Mus., XIX, 1896, p. 343 (White 
Oaks, New Mexico). 
Ashmunella pseudodonta Dall, Proc. U. 8. Nat. Mus., XXIV, 1902, p. 500, 
Pl. 27, figs. 13, 15; Pl. 28, figs. i¢ 
Ashmunella pseudodonta Pils. and Ckll., Proc. Acad. Nat. Sci. Phila., 1899, 
p. 192; Murdoch, Jour. of Malac. , VILL, p. 79, Pl. 7, figs. 1-7 (anatomy). 
Phislcdecies differs from those of the Sierra Blanca chiefly by its more 
depressed shape and the bifid basal callous, which is split into two low 
denticles like some of the subspecies of A. thomsoniana. The compara- 
tively short duct of the spermatheca shows A. pseudodonta to be much 
more closely related to A. rhyssa than to A. thomsoniana. Five speci- 
mens of the original lot collected by Mr. Ashmun at White Oaks, New 
Mexico, measure: 
Alt., i. Fe 6.5 6.4 6.4 mm. 
Diam., 13 WAN f2e7 12.2 gs 
Two specimens found with A. p. capitanensis measure: 
Alt. ~ “67am. 
Diam., 13.9 13.5 “ 
The internal anatomy has been well described and figured by Mur- 
doch. 
Ashmunella pseudodonta capitanensis Ashm. and Ckll. Pl. XII, figs. 21-23. 
A. p. capitanensis Ashmun and Cockerell, Nautilus, XII, p. 131, March, 1899. 
The shell is depressed, glossy, brown, with weak irregular growth- 
wrinkles and fine, close incised spirals. The spire is very low conic. 
Whorls 54, quite convex, the last wide, rounded peripherally, swollen 
above behind the deep constriction behind the lip. The aperture is 
quite oblique, the lip either brown-tinted throughout or white. Within 
the basal margin there is a low, very weakly bifid callous, often hardly 
noticeable. There is a very small parietal tooth in four out of six 
specimens examined. The umbilicus is small and deep within, enlarg- 
ing at the last whorl, rather broadly exposing the penultimate whorl. 
Alt., 9 9.5 9.2 9 9 9 mm. 
Diam., 18.5 18 17.8 17 ibs ee 
