248 PROCEEDINGS OF THE ACADEMY OF [Mch., 



set parietal tooth, and in old shells a very low diverging ridge between 

 it'and the outer insertion of the lip. 



Alt. 4^, diam. 13^ mm. 



Florida Mountains, I^una county. New ^Mexico, in a rock talus near 

 the top of the mountain, at an elevation of probably about 6,500 feet. 

 Co-types in collections of J. H. Ferriss and A. N. S. P., No. 87,101. 



Only a few specimens were found, and none living. While related 

 to the carinate forms of the A. levcttei group, and to A. mearnsi by the 

 structure of the aperture, this species is flatter than any of them, and 

 differs especially in the small number of whorls — less than in any other 

 Ashmunclla. It was named in honor of Mr. Bryant Walker, of Detroit. 



Ashmunella mearnsi (Dall). PI. XIV, fig. 62; PI. XVI, fig. 116. 



Polygyra viearnsi Dall, Proc. U. S. Nat. Mus., XVIII, 1895, p. 2 ("Hachita 

 Grande and Huachuca Mountains, New Mexico"); Proc. U. S. Nat. Mus., 

 XIX, 1896, p. 343, PI. 32, figs. 7, 8, 11; Cockerell, Nautilus, XI, October, 

 1897, p. 69 (Filmore Canyon, Organ Mountains, New Mexico). 



Ashmunella mearnsi Dall, Ancey, Jour, of Malac, VIII, September, 1901, 

 p. 74. 



In this species an accessory parietal lamella, incipient or rudimentary 

 in A. walkeri and some forms of the levettei series, is well developed. 

 The lip-teeth are arranged as in the A. levettei group. It is nearer A. 

 walkeri than any other known species, but some specimens of A. angu- 

 lala (fig. 58) have a weak upper arm of the parietal V. 



The geographic range is wide for a species of this group: the Hua- 

 chuca Mountains, in southeastern Cochise county, Arizona, the Ha- 

 cheta Grande Mountains, Grant county, southwestern New Mexico, and 

 the Organ Mountains, Donna Ana county. New Mexico, east of the 

 Rio Grande. All of these localities are near the Mexican boundary. 



The specimen figured is one of those collected in the Huachuca 

 Mountains by the well-known ornithologist Edgar A. Mearns, for whom 

 the species was named. 



The remarkable parietal armature is w-eakly foreshadowed in A . wal- 

 keri, some forms oi A. I. angigyra, etc. The soft anatomy remains 

 unknown. 



Group of A . esuritor. 



Aperture of the shell without teeth. Length of the spermatheca and 

 its duct about 90 per cent, that of the penis, epiphallus and flagellum, 

 which do not much exceed twice the diameter of the shell. 



A single species from the Chiricahua Mountains differs strikingly 

 from the levettei and chiricahuana groups in the proportions of the 

 genitalia, the epiphallus being as short as in the thomsoniana group, 

 while the spermathecal duct is much longer. 



