ANCEY : ON THE GENUS ASHMUNELLA. 75 



levetlel, but tlwmsoniana, Anc). Near Tucson, Arizona (Cox) ; Fort 

 Huachuca, Arizona (Fisher) ; Huachuca Mountains, Arizona, near 

 the summit of the higher peaks (Mearns). 



Ashmunella thomsoniana (Ancey). 



Triodopsis Icvetlei, Bland van thomsoniana, Ancey : Conch. Exch., 

 1887, ii, p. 64. 



Triodopsis lecetiei, Bland var. orohaena, Ancey : Loc. cit. supra. 

 (This is but an individual modification of tlwmsoniana, 

 and not a true variety). 



Shell depressed, in form closely resembling A. 'pseudodonta, but 

 with an acute denticle within the outer lip and a single hardly bifid 

 basal tooth ; there is no notch as in pseiulodonta, but a distinct basal 

 tooth, in some specimens it is simple or nearly so, while in others it 

 is bifid, in the latter case the tubercle nearest the umbilicus is less 

 raised than the outer one; whorls ^\, the last deflected at its termina- 

 tion ; surface shining, with faint incremental striae ; spire depressed, 

 but not flat. 



Alt. 7'5; diam. i2'i4 millim. 



Loc. — Santa Fe Canyon, New Mexico (Thomson, also Ashmun). 



Ashmunella thomsoniana (Ancey), var. porterae, Piis. and Ckii. 



Nautilus, 1899, vol. xiii, p. 49. 



Shell corneous, shining, with distinct lines of growth and minute 

 spiral incised lines; umbilicus broadly exposing the penultimate whorl; 

 whorls 5I — 6; lip ochreous-tinged above and at the edge, the teeth 

 white; parietal tooth well-developed, outer tooth long, basal tooth 

 always bifid. 



Diam. max. 14 to i6"5 millim. 



Loc. — Beulah, Upper Sapello Canyon, New Mexico (Miss W. 

 Porter and Miss H. Blake). 



Ashmunella pseudodonta (Dall). 

 Polygyra pseudodonta, Dall: Proc. U. S. Nat. INIus., 1S96, No. 



iiii, P- 343- 

 Similar to A. ashmuni in size and form, but with the whorls 

 slightly flattened above and below, and of a yellowish-straw colour 

 instead of livid brown ; the spiral striations less sharp and largely 

 obsolete. The aperture with a narrow reflected lip, pink or whitish ; 

 on the internal edge of the basal part is a slight callosity, which is 

 divided by a narrow sulcus in the direction of the coil of the shell ; 

 within the aperture and nearly midway between the outer and pillar 



