440 



HELICID^. 



Fig. 700. 



Shell whitish, shining, cylindrical, obtuse at the apex ; 

 whorls rather more than five, convex ; suture well-im- 

 pressed ; aperture lateral, two thirds as wide as the last 

 whorl, sub-orbicular, with a single tooth (sometimes two) 

 on the parietal wall near the centre, and a tooth-like en- 

 largement near the umbilical termination of the peristome, 

 which is white, reflected ; umbilicus very minutely perfo- 

 rated. Length two and a half, diameter one mill. 



From Maine and Wisconsin to South Carolina and Mis- 

 sissippi. 



Genus VERTIGO, Muller. 1774. 



Shell deeply rimate, ovate, apex acuminate, obtuse ; whorls five 

 to six, the last rounded ; aperture semi-oval, with from four to seven 

 folds ; peristome scarcely expanded, white-lipped. 



Lower tentacles wanting. 



Jaw smooth, or with longitudinal wrinkles, substriate. 



Lingual membrane broad, central teeth tricuspid, laterals bicus- 

 pid or serrate, uncini serrate. 



Vertigo Gouldii. 



Shell cylindrical ovate; whorls rather more than four; aperture lateral, with 

 five teeth; umbilicus a little open. 



Pupa GonMii, BiNNEY, Pioc. Bost. Soc. i. 10.5 (1843) ; Terr. ISIoll. ii. 332, pL 61, fig. 2. 



— Gould, Bost. Journ. iv. 352, pi. 16, fig. 9, (1843). — Pfeiffer, Mon. IIcl. Viv. 



ij. 358. — KiJsTER, in Chemxitz, 2d ed. 124, pi. 16, figs. 20-23. 

 Verthp Gouldii, Stimpson, Sliells of New England, 53, no descr. — W. G. Binney, Terr. 



Moll. iv. 148. — Morse, Am. Nat. 1. 669, fig. 60 (1868). 

 Islhmia Gouldii, Mouse, Journ. Portl. Soc. i. 38, fig. 95 ; pi. 10, fig. 96 (1864). 



Shell light chestnut, cylindrical-ovate ; 

 whorls rather more than four, ventricose, 

 the last occupying nearly one half the 

 length of the axis ; aperture lateral, com- 

 posed of two unequal curves meeting in 

 the centre of the peristome, with five prom- 

 inent white teeth, namely, one upon the 

 transverse margin, two upon the umbilical 

 margin, and two upon the labial margin ; 



peristome thickened, not reflected ; umliilicus a little open. Length 



two, diameter one mill. ; aperture two thirds long. 

 From Maryland through New England. 



V. Gouldii. 



