190 



A MANUAL OF AMEHICAN LAND SHELLS. 



Full information on the species is given by Morcb, I. c. He describes 

 the animal as grayish j foot bluish gray ; head, eye-peduncles, and man- 

 tle margin black ; eye-peduncles rather long ; tentacles none or nearly 

 none ; the foot a little shorter than the shell. He refers also to an 

 albino variety, destitute of epidermis. 



Jaw, dentition, and genitalia unknown. 



VERTIGO. (See below.) 

 Vertigo Oouldi, Binney. 

 Shell light chestnut, cylindrical-ovate; whorls rather more than 4, 

 ventricose, the last occupying nearly one-half the length of the axis , 



aperture lateral, composed of two unequal 

 curves meeting in the center of tbe peristome, 

 with five prominent white teeth, namely, one 

 upon the traverse margin, two upon the um- 

 bilical margin, and two upon the labial mar- 

 gin ; peristome thickened, not reilected ; um- 

 Length, 2™"; diameter, 1'""'; aperture, §'"'" long. 



Fig. 191. 



Vertigo Oouldi. 



bilicus a little open 



Pv2)a Goiddii, Binney, Proc. Bost. Soc. Nat. Hist., i, 105 (1843) ; Terr. Moll., ii. 332, 

 pi. Ixxi, fig. 2. — Gould, Bost. Joiirn. Nat. Hist., iv, 352, pi. xvi, fig. 9 (1843). 

 . — Pfeiffer, Men. Hel. Viv., ii, 358; Kuster, iu Chemnitz, id. 2, 124, pl. xvi, 

 figs. 20-23. 



Vertigo Gouldii, Stimpson, Shells of N. E.. 53 (no descr.).— "W. G. Binney, Terr. Moll., 

 iv, 148; V, 214; L. & Fr.-W. Sh., i, 250 (1869).— Tryon, Am. Jouru. Coucli., 

 iii, 309 (1868).— Gould aud Binney, Inv., 440, fig. 701 (1870).— Morse, 

 Amer. Nat., i, 669, fig. 60 (1868). 



Isthmia Gouldii, Morse, Jouru. Portl. Soc, i, 38, fig. 95, pl. x, fig. 96 (1864). 



From Maryland through New England. It therefore belongs to the 

 Northern Eegion, extending along the Appalachians into the Interior 

 Region. 



Animal with no tentacles; black above, foot gray ; tapering poste- 

 riorly and rounded at the extremity ; carries the shell at an angle of 

 about forty-five degrees. 



Jaw scarcely arcuate, of equal size 

 throughout, ends rounded, anterior sur- 

 face with longitudinal lines and trans- 

 verse striae ; concave margin simi)le, no 

 median projection. 

 Lingual dentition of reriig-oGoMidi (Morse). Liugual membrane with 75 rows, each 

 row containing 23 (11-1-11) short and stout teeth ; 7 perfect laterals. 

 Centrals tricuspid ; laterals bicuspid ; marginals serrated. 



It has been referred to V. Alpestris, Aid., by Gwyn Jeffreys (1872, p. 

 246, Ann. Mag. Nat. Hist.). 



Fig. 192. 



mo^®^ 



