212 'TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Pupa alticola, INOERSOLL. 



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

 striate, subtranslucent, 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-whorl 

 suture deeply impressed ; aperture small, oblique, subtriangu- 

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

 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, INOERSOLL, 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 1 1 6 is drawn from an authentic specimen. 



DOUBTFUL AND SPURIOUS SPECIES OF PUPA. 



Pupa placida, SAY, is probably an accidentally introduced specimen of Buliminus 

 obscurus, MULLER (see Boston Proc., I. 105). The original description here 

 follows : 



Shell dextral, cylindric-conic, pale 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 almost to conceal the umbilicus ; labrum, 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 labrum is not reflected and 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. Y. Moll., 51. GOULD, Invert., 192. 



Pupafallax, p, PFEIFFER, Mon. Hel. Viv., II. 309. 



Bidimus hordeanus ? DEKAY, 1. c. BINNEY, Bost. Proc., I. 105. 



Bulimus obscurus, GOULD, Mon. Pupa, p. 17. PFEIFFER, III. 350, on DE- 

 KAY'S authority. 



