234 APPENDIX, VOL. XXV: VERTIGO. 



are joined by a parietal callus. He states that it differs from 

 Pupa inornata (P. edentula auct.) by the connected peri- 

 stome; moreover the summit is more Vertigo-like, the size 

 smaller, and the striation more distinct, It has usually been 

 placed in Puptila, but may more likely be a toothless Vertigo 

 close to or specifically identical with V. gemsvi Gredler (Vol. 

 XXV, p. 204), as claimed by Schlesch. Bourguignat's figure 

 is copied in our pi. 20, fig. 11, Clessin's in pi. 20, fig. 21. 



VERTIGO HINKLEYI n. sp. PL 6, figs. 12-16. 



The shell is minute, oblong-cylindric, of cinnamon-buff 

 color, glossy, nearly smooth, very thin. The whorls are rather 

 convex, the last three forming the more or less cylindric por- 

 tion ; the last whorl tapers to the narrow base ; there is a de- 

 pression behind the auricle of the lip, and behind that a 

 larger, deeper dorse-lateral impressed area extending nearly 

 to the base. The aperture is shortly piriform, with strongly 

 defined sinulus, limited below by a deeply bent in and thick- 

 ened angle of the outer lip. The peristome is slightly ex- 

 panded around the sinulus, elsewhere strongly so. The pari- 

 etal lamella is rather remote from the edge of the thin pari- 

 etal callus, low in front, high within, and enters deeply. The 

 columellar lamella is deeply placed, not very long, ascending 

 a little inwardly. Below it there is a subcolumellar tooth 

 (probably a shifted basal fold). The upper palatal fold is a 

 high lamina, abrupt in front, where it arises some distance 

 within the lip. Close to its inner end there is a short fold, 

 apparently the lower palatal; only its anterior end can be 

 seen in the aperture. 



Length 1.55, diam. 0.75 mm. ; 5% whorls. Type. 



Length 1.75, diam. 0.77 mm. ; 6 whorls. Type. 



Arizona: Cave canyon, Huachuca Mountains, at Station 

 295, near the reservoir (Hinkley and Ferriss, 1919). Type 

 no. 46243, A. N. S. P. Also two specimens at Station 296. 



This remarkable little Vertigo is so unlike known species 

 that comparisons need not be made. The peculiar shape of 

 the aperture is characteristic, and the teeth differ strongly 

 from all other species. 



