200 TERRESTRIAL AIR-BREATHING MOLLUSKS. 



Pupa pentodon, Say. 

 Vol. III. PI. LXXII. Fig. 1. 



Shell siibperforate, 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 of these, and sometimes two, is on 

 the parietal wall, two on the columellar portion 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, PI. XVI. Figs. 10, 11 

 (1843). — DeKay, N. Y. Moll., 50, PI. IV. Fig. 48; PI. XXXV. Fig. 337 

 (1843). — Pfeiffer, Mon. Hel. Viv., II. 359; in Chemnitz, ed. 2, 125, Ph 

 XVI. Figs. 24-26. —BiNNEY, Terr. Moll., II. 328, PI. LXXII. Fig. 1. — 

 W. G. BiNNEY, Terr. Moll., IV. 143 ; L. &Fr.-\V. Sh., I. 238 (1869). —Gould 

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



Pupa curvidens, Gould, Invertebrata, 189, Fig. 120 (1841). 



Pupa Tappa7iiana, Adams, Silliman's Journ., [i] XL. Suppl. ; Shells of Vermont, 

 158 (1842). —Pfeiffer, Symbolse, 11. 55. 



Leucochila pentodon, Morse, Journ. Portl. Soc, I. 36, Fig. 85 ; PI. X. Fig. 86 

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



Pupilla pentodon, Tryon, Am. Journ. Conch., 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 

 Btriate, concave margin minutely notched. 



