Major diameter 17, minor diameter 14 ; height 9 mm.

White Mountains of New Mexico

Shell of six rounded whorls, dark yellowish-brown, the suture rather deep and the spire low but not flattened ; nuclear whorls nearly smooth, the rest of the shell rather coarsely obliquely striated, the last fourth of the last whorl with rather sharp elevated riblets with wider interspaties and a marked constriction behind the reflected peristome; umbilicus small, deep ; periphery above the middle of the whorl rounded, the entire surface more or less distinctly finely spirally striate; aperture subcircular, oblique, with a reflected and rather solid peristome with a small obscure thickening on its basal part, a light wash of callus over the body, and slightly within the aperture a small oblique elongated parietal denticle.
(Dall, 1897. Original description)

This species is about the size of A. chiricahuana Dall, from which it differs by its strong sculpture, somewhat larger umbilicus, more distinct suture and oral armature. The form of the mouth resembles that of P. pseudodonta Dall, but the basal thickening of the lip is not notched and the shell is decidedly larger, more coarsely sculptured and somewhat darker in color.