1915.] NATURAL SCIENCES OF PHILADELPHIA, 349 



•Oreohelix strigosa var. 



Two broken and very old "bones" were found near the central 

 peak above the spring, where we found Ashmunella and Sonorella. 

 The largest one, evidently adult, has the periphery- bluntly angular 

 in front, becoming rounded on the last half whorl. There are faint 

 traces of bands above and below it. Spire rather elevated. Height 

 10.6, diam. 17.5, umbilicus 4 mm. It differs from 0. s. depressa 

 by the angulation of the periphery. Possibly an exploration of the 

 southern end of the range, which from a distance looks rather good, 

 would reveal living Oreohelices, but we looked for them in vain in 

 the central and northern parts. 



Thysanophora hornii (Gabb). 

 Vallonia perspectiva Sterki. 

 Bifidaria pilsbryana Sterki. 

 Bifidaria ashmuni Sterki. 



HI. Peloncillo Mountains. 



Sonorella hachitana peloncillensis n. subsp. 



The shell is a little less depressed than hachitana, with, the last 

 whorl not so deeply descending, the aperture not so oblique and a 

 trifle larger. 



Alt. 13.5, diam. 23.7, umbilicus 3.8 mm. 

 " 12.5, " 22.8 mm. 

 " 11.7, '' 19.6 " 



Peloncillo Mountains: Skull Canyon, Grant Co., New Mexico. 

 Types, Xo. 94,513, A. N. S. P., collected by J. H. Ferriss, 1907. 



The genitalia (figs. 6A to 6C, and figs. 6D, E, penis-papillse of 

 other individuals) resemble the same organs in S. flora. The penis 

 is encircled by a sheath which reaches nearly to the middle. The penis- 

 papilla is slender, tapering, and subannulate or rather stronglj^ 

 annulate. Epiphallus and flagellum as usual in the group of hachi- 

 tana. It differs from S. hachitana by the decidedly longer penis, 

 which has a much longer basal sheath. The vagina is slightl}'- 

 shorter than the penis, while in S. hachitana and floi-a it is slightly 

 longer. oMeasurements are given on page 328. 



The sole is fleshy-buff, of nearly uniform tint, the side areas not 

 distinct. Back ashy; sides and tail flesh-tinted. 



Explanation of Plates V, VI, VH. 



Plate V — Figs. 1, la, 16, 1/. — Ashmunella mearnsi (Dall). Station 5, Big 

 Hachet Mts. 

 Figs. If, If?, le. — Ashmunella mearnsi (Dall). Station 11. 



