212 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Pupa alticola, Ingersoll. 



Shell perforate, straight, two and one half times as long as broad, densely 



striate, subtranshicent, chestnut-brown, apex obtuse ; whorls 6 or 7, convex, 



the middle three of the spire equal, causing a parallelism in 



the" sides of the shell, the last noticeably greater, expanding 



toward the aperture, not closely appressed to the body-wborl • 



suture deeply impressed ; aperture small, oblique, subtriangu- 



lar, margins connected by a thin deposit, without internal pro- 



I cesses ; peristome simple, somewhat reflected over the umbilicus. 



Cunningham Gulch, Colorado; Rio La Plata. 



It will not be difficult to recognize this species by its parallel 



sides, base-like expansion»of the last whorl, coarse incremental 



lines, and edentate aperture. It seems to be an essentially 



Pupa alticola. 



alpine species, none having been found at an elevation less 

 'than 8,000 to 9,000 feet. It was plenty in the localities mentioned above. 

 (Ingersoll.) 



Animal not observed. 



Pupilla alticola, Ingersoll, Bulletin U. S. Geol. Geogr. Surv. of the Terr., No. 

 2, p. 128 (1875) ; ed. 2 (1876), p. 391, Fig. 



A species of the Central Region. 



Figure 116 is drawn from an authentic specimen. 



Doubtful and Spurious Species of PurA. 



Papa placida, Say, is probably an accidentally introduced specimen of Buliminus 

 obscurus, Muller (see Boston Proa, I. 105). The original description here 

 follows : — 



Shell dextral, cylindric-conic, paie yellowish horn-color ; apex whitish, obtuse ; 

 whorls 6i, somewhat wrinkled ; suture moderately impressed ; aperture unarmed, 

 longitudinally oval, truncate a little obliquely above by the penultimate volu- 

 tion ; columella so recurved as almo'st to conceal the umbilicus ; labruni, with 

 the exception of the superior portion, appearing a little recurved when viewed in 

 front, but when viewed in profile, this recurvature is hardly perceptible ; um- 

 bilicus very narrow. 



Length over three tenths of an inch. Inhabits Massachusetts. 



For this shell I am indebted to Dr. T. W. Harris, of Milton, from whom I have 

 received many interesting species of our more northern regions. At first view 

 it might be mistaken for the P. marginata, Nob., but it is quadruple the size, 

 and the lafimm is not reflected anti thickened. (Say.) 



Pupa placida, Say, New Harmony Diss., II. 230 (1829) ; Descr. 24 (1840) ; 

 BiNNEY'sed., 39. — W. G. Binney, Terr. Moll., IV. 145. 



Pupafallax, DeKay, N. V. Moll, 51.— Gould, Invert., 192. 



Pupa fall ax, (3, Pfeiffer, Mon. Hel. Viv., II. 309. 



Bulimus hordcanus? DeKay, 1. c. — Binney, Bost. Proa, I. 105. 



Bulimus obscurus, Gould, Mon. Pupa, p. 17. — Pfeiffer, III. 350, on De- 

 Kay's authority. 



