EASTERN PROVINCE INTERIOR REGION SPECIES. 333 



very minutely striated, decreasiog slightly to the apex, which is ob- 

 tuse; suture deep; peristome white, slightly reflected; aperture lat- 

 eral, half the width of the last whorl, within brownish, general r,o. 361. 

 shape semicircular, truncated abruptly and directly by the last 

 whorl, a testaceous deposit upon which forms the transverse 

 margin and connects the two extremities of the peristome ; cir- "^ 

 cumference made up of two curves of different radius uniting wUium. 

 in the peristome, where the junction causes an angle projecting in- 

 M^ards, the smaller curve comprising about one-fourth part and forming 

 the superior portion of the peristome; teeth G, two on the transverse 

 margin, sharp, projecting, and tooth-like ; one in the angle between 

 the columellar and transverse margins, broad, massive, and prominent, 

 with occasionally one or more tubercles about its base; one on the 

 lower part of the columellar margin ; two on the peristome, in the base 

 of the aperture, and at the junction of the two curves ; umbilicus 

 rather wide. Length, A""" ; diameter, |™™. 



Pupa milium, Gould, Bost. Journ. Nat. Hist., iii, 4C2, pi. iii, fig. 23 (1840) ; iv, 359 

 (1843); Invertebrata, 187, fig. 118 (1841).— De Kay, N. Y. Moll., 48, pi. W, 

 fig. 44 (1813).— Adams, Vermont MoUusca, 157 (1842).— Pfeiffer, Mou. Hel. 

 Viv., ii, 362. — Binney, Terr. Moll., ii, 337, pi. Ixxi, fig 1 ; v, 25.— Kuster, in 

 Chemnitz, ed. 2, 119, pi. xv, fig. 39-42. 



Vertigo milium, W. G. Binney, Terr. Moll., iv, 148. — Morse, Amer. Nat., i, 669, figs. 

 65, 66 (1868). 



From New England to Texas. A species of the Eastern Province. 



Animal very light gray, darkest above; foot thick, broadest behind 

 the middle, tapering suddenly to a point; eye-peduncles somewhat 

 globular at tips, in the center of which are the eye-spots ; no tentacles. 



The most minute of our species, but though the eye cannot, without 

 the aid of the microscope, detect its characters, they are very strongly 

 defined. The parts about the aperture are particularly well-developed, 

 the teeth being long, compressed, and sharp, and the transverse 

 margin distinctly bounded. Professor Adams mentions that twelve 

 mature specimens weighed less than a sixteenth of a grain. It is 

 found under or among dead leaves. It is gregarious in its habits; 

 when one is found, many others may be quite certainly found near it. 



Vertigo ovata, Say. 



Shell minute, ovate-conic, veutricose, dark amber-colored; whorls 5, 

 very convex, the last much intiated, diminishing rather rapidly to a 

 somewhat acute apex, with an indentation towards the aperture; 

 suture rather deep; peristome thin, somewhat expanded, with a groove 



