AMERICAN SPECIES OF VERTIGO. 119 



23. VERTIGO CONCINNULA Ckll. PI. 10, figs. 9, 10. 



Shell ovoid-cylindrical in outline, slightly tapering toward 

 the blunt apex ; solid and somewhat opaque, so that the palatal 

 folds are usually only dimly seen through from the outside. 

 Surface shining, irregularly, obliquely striate, more strongly 

 so 011 the penult whorl. Whorls 5, apical 2 whitish, the rest 

 cinnamon (often with numerous irregularly scattered spots 

 and flecks of very light buff) . Whorls quite convex, the last 

 slightly ascending toward the aperture, its latter half very de- 

 cidedly flattened on the outer-inferior portion, this part bear- 

 ing a moderate or low wavelike crest or ridge behind the lip, 

 and then slightly constricted. Umbilical rimation short, im- 

 perforate. Aperture rounded, truncate above; peristome a 

 little expanded ; parietal wall bearing a rather strong entering 

 parietal lamella in the middle, and usually a smaller angular 

 lamella to the right of its outer end ; columella with a strong, 

 deep-seated entering lamella ; outer wall with two rather low, 

 long palatal folds, the lower one longer. Length 2.1, diarn. 

 1.2 mm. 



Colorado: Custer and Summit counties, 6,000-10,000 ft. 

 (Cockerell), and other places noted below. New Mexico: 

 Beulah, Sapello canyon, T. D. A. Cockerell; Bland, Jemez 

 Mts. and Capitan Mts., Ashmun ; Cloudcroft, Sacramento Mts., 

 H. L. Viereck; Mogollon Mts., on Turkey, Willow and Silver 

 Creeks, Ferriss and Daniels. Arizona : Mt. Mingus, near 

 Jerome, Ashuiun. 



Vertigo californica Rowell, INGERSOLL, Bull. U. S. Geol. 

 Surv. Terr., i, p. 128 (1875) ; Ann. Rep. U. S. Geol. and Geogr. 

 Survey Terr, for 1874, Hayden, p. 392, 1876. No description. 

 Not of Rowell. Vertigo ingersolli Ancey MSS. in COCKERELL, 

 J. of Conch., Leeds, vi, 1889, p. 64 (name only, substituted 

 for P. californica Ing. 11011 Row.). STERKI, Nautilus, vi, 1892, 

 p. 5, with varieties haydeni Anc. and accedens Anc. (names 

 only). COCKERELL, Nautilus, x, 1897, p. 135 (identity with 

 concinnula affirmed from part of original lot). Pupa inger- 

 solli Ancey MS., COCKERELL, British Naturalist, 1891, p. 101 ; 

 reprinted in Nautilus xvi, p. 59. Vertigo concinnula COCKER- 



