200 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Pupa pentodon, SAY. 

 Vol. III. PL LXXH. Fig. 1. 



Shell subperforate, of an elongated ovate form, minutely striated, and of a 

 spermaceti or whitish horn-color ; whorls about 5, well rounded, and separated 

 . by a deep suture; apex rather acute; 



aperture oblique, nearly semicircular; per- 

 istome sharp, and somewhat expanded, 

 but not reflexed; the submargin of the 

 throat is thickened by a ridge of white 



callus, on which the denticles are situated ; 

 Pupa pentodon. . , 



one 01 these, and sometimes two, is on 



the parietal wall, two on the columellar poi-tiou of the peristome, and two con- 

 stantly, and from one to five others occasionally, on the other portion of the 

 peristome ; of these, that near the middle of the parietal wall is largest, that at 

 the upper part of the columella is next, and^one opposite the first, on base of 

 the aperture, is the third in size. Length, 2 mill. ; diameter, 1 mill. ; of aper- 

 ture, length, | mill. 



Vertigo pentodon, SAY, Journ. Acad. Nat. Sci. Phila., II. 476 (1822) ; ed. BIN- 

 NEY, 27. 



Pupa pentodon, GOULD, Bost. Journ. Nat. Hist., IV. 353, PL XVI. Figs. 10, 11 

 (1843). DEKAY, N. Y. Moll., 50, PL IV. Fig. 48; PL XXXV. Fig. 337 

 (1843). PFEIFFEE, Mon. Hel. Viv., II. 359; in CHEMNITZ, ed. 2, 125, PL 

 XVI. Figs. 24-26. BINNEY, Terr. Moll., II. 328, PL LXXII. Fig. 1. - 

 W. G. BINNEY, Terr. Moll., IV. 143 ; L. &Fr.-W. Sh., I. 238 (1869). GOULD 

 and BINNEY, Inv. of Mass., ed. 2, 404 (1870). 



Pupa curvidcns, GOULD, Invertebrata, 189, Fig. 120 (1841). 



Pupa Tappaniana, ADAMS, Silliman's Journ., [i] XL. SuppL; Shells of Vermont, 

 158 (1842). PFEIFFER, Symbol, II. 55. 



Leucochila pentodon, MORSE, Journ. Portl. Soc., I. 36, Fig. 85; PL X. Fig. 86 

 (1864) ; Amer. Nat., 667, Fig. 56 (1868). 



Pupilla pentodon, TE.YON, Am. Journ. Couch., III. 303 (1868). 



Northern and Interior Regions, having been found from Georgia and Mis- 

 sissippi to the most northern portions of the Union. It is usually found at 

 the foot of trees and under leaves. 



Animal blackish above, light gray below ; foot moderately long, the trans- 

 verse fissure very distinct, the anterior portion having the mouth in the centre, 

 and bilobate in front. Tentacles about one third as long as the eye-peduncles. 

 Very sluggish in its movements, and carries the shell nearly horizontally, or 

 very slightly elevated. 



Jaw slightly arcuate, of uniform breadth, anterior surface longitudinally 

 etriate, concave margin minutely notched. 



