120 AMERICAN SPECIES OP VERTIGO. 



ELL, Nautilus, x, 1897, p. 135. PILSBRY and VANATTA, Proe. 

 A. N. S. Phila. 1900, p. 599, pi. 23, f. 8. J. HENDERSON, Univ. 

 of Colo. Studies iv, p. 172 (Animas Valley, Rio La Plata and 

 Cunningham Gulch, Cockerell, Naut. x, 135. Summit and 

 Custer Counties and Black Lake Creek, Cockerell. "Vertigo 

 calif ornica" Ing., Blue River Valley, Los Pinos Agency, S. W. 

 of Los Pinos ; Howardsville, Animas Valley and Rio La Plata, 

 Ingersoll, 1874, 392. Eldora, Henderson). WHEELER, Nau- 

 tilus xxv, 124 (Monte Sano, Madison Co., Ala.). Pupa con- 

 cinnula Ckll., PILSBRY, Nautilus, xi, 1898, p. 119; Class. Cat. 

 L. Sh. Amer., p. 21 ; Nautilus, xii, 1899, p. 103. 



The dull, rather opaque shell, cylindrical and small, with 

 long palatal folds and parietal lamella, separate this from 

 V. modesta and its varieties. It approaches V. modesta parie- 

 talis, which, however, is larger and smoother, with shorter 

 parietal lamellae and palatal folds. The form of modesta 

 from Labrador agrees with concmnula in having the penult 

 whorl distinctly striate. The larger size, more cylindrical 

 shape and presence of an angular lamella distinguish con- 

 cinnula from V. coloradensis. V. c. inserta is distinctly 

 smaller than c&ncinnula. In Colorado, according to Professor 

 Cockerell, it occurs at higher elevations than V. coloradensis, 

 between 6,000 and 10,000 feet; but in the Mogollon Mountains, 

 N. M., concinnula is found in the same zone with V. colora- 

 densis arizonensis. 



This species was first collected by Ernest Ingersoll, who 

 identified it with the West Coast V. calif or nica. Ancey de- 

 tected the error, and named it Vertigo ingersolU in MS. In 

 1891 Professor Cockerell published a brief descriptive note on 

 V. ingersolU: "It is allied to coloradensis, but 2 mm. long, 

 cylindrical, dull brown, with a half whorl more, and a double 

 lamella on the parietal wall." As the number of whorls of 

 V. coloradensis had not been stated, and there are two lamellae, 

 not a "double lamella," on the parietal wall, I have held this 

 note to be insufficient to establish a species (Nautilus xvi, 59). 

 The first recognizable description is that of concmmda 

 Cockerell, 1897. Since ingersolU is known solely by Cocker- 

 ell's several notes, no description of Mr. Ancey 's type having 



