74 ANCEY : ON THE GENUS ASHMUNELLA. 



true Polygyra; and with all due deference to the opinion of Messrs. 

 Pilsbry and Cockerell, who referring to A. tliomsoniana'' state that "the 

 species differs widely from Pohjgyra levettei, which is not an Aslimu- 

 nella, but apparently a true Pulyji/ra." If I am correct, that is if we 

 must include in Aslimunella P. lereftei and P. mearnsii, the shell 

 diagnosis has to be modified in regard to the parietal tooth. In the 

 latter species there are two converging lamellae, not united at their 

 inner ends into a A, the basal lamella stouter and its outer extreme 

 bent towards the umbilicus. 



Catalogue and shell characters of Ashmunella. 



Ashmunella mearnsii (Dail). 



Polygijra mearnsii, Dall : Proc. U.S. Nat. Mus. 1896, p. 343, 

 pi. xxxii, figs. 7, 8, II. 



Shell depressed, 5-whorled, of a pinkish brown colour, with more 

 or less conspicuous incremental lines ; spire nearly flat ; sutures very 

 distinct ; periphery rounded, but nearer the upper surface of the 

 whorl ; base rounded with a compressed appearance ; umbilicus deep 

 and narrow ; body whorl slightly descending at the termination, and 

 constricted behind the reflected lip of a very oblique aperture ; peris- 

 tome somewhat flexuous, united over the body by a distinct callus ; 

 the body with two converging lamellae, and the basal part with two 

 distinct clear-cut lamellae transverse to the lip ; outer lip broad, 

 receding, with a similar lamella set on somewhat obliquely and more 

 deeply within the aperture. 



Alt. 5"5; diam. max. 15, min. 11 millim. 



Loc. — Huachuca Mountains, Arizona ; Hachita Grand Mountain, 

 S.W. New Mexico, altitude 8,000 to 9,400 feet (Dr. Mearns) ; Organ 

 Mountain, New Mexico (Prof. Townsend). 



Ashmunella levettei (Bland). 



Triodopsis levettei, Bland: Ann. N. Y. Ac. Sci., 1881, ii, p. 115. 



Pol yjym levettei, Bland: Dall, Proc. U. S. Nat. Mus., 1S96, p. 341. 



Shell larger than mearnsii, with 7 whorls, less depressed, and a 

 single oblique tooth on the parietal wall. 



Loc. — Said to occur in Santa Fe Canyon, near Santa Ft', New 

 Mexico, but not again found there since its discovery by Levetce. 

 (Specimens sent from this locality by the late J. H. Thomson are not 



2 Nautilus, 1S99, vol. xiii. p. 50. 



