192 A MANUAL OF AMKh'KWN LAND 8lTELL«. 



Pupa simplex, Gould, Bo8t. Journ. Nat. Hist., iii, 403, pi. iii, fig. 21 (1840); iv, 3.")') 



(1843); InvertPbratn, 190, fig. 1-21 (1841).— Pfeiffer, Mon. Hcl. Viv., ii. 



302.— De Kay, N. Y. MolL, r)2, pi. xxxvi, fig. :M7 (1843).— Binney, Terr. Moll., 



ii, 343, 1)1. Ixxii, fig. 3. 

 Vertigo aiviplex, Stimpson, Shells of New England, 53 (no descr. ). — W. (J. Binnky, 



Terr. Moll., iv, 148 ; v, 219; L. & Fr.-W. Sh., i, 254 (1869).— Mokse, Amer. 



Nat., i, 670, figs. 67, 6-<(1868).— Tryon, Amer. Jonrn. Conch., iii, 310 (1868).— 



Gori.D and Bixxey, Inv. of Mass., ed. 2. 444 (1870). 



Canada and New Englaud; a species of the Nortbein Eegioii. 



Animal dark gray above, light gray and pellucid below ; foot mod- 

 erately long, trilobate anteriorly, the middle lobe minnte ; eye-pednncles 

 usually clavate, sometimes very decidedly ; no tentacles; sliell carrie«l 

 perpendicularly, or even inclined forwards ; active in movement. 



Eeferred to V. edentula, Drap., by Gwyn Jeffreys (Ann. Mag. Nat. 



Hist., 1872, 246). 



Vertigo veiitricosa, Morse. 



Shell umbilicate, ovate-conic, smooth, polished; apex obtuse; suture 

 ^iG- 196. deep; whorls 4, convex; aperture semicircu- 



lar, with 5 teeth, one prominent on the parie- 

 tal margin, two smaller on the columellar mar- 

 gin, and two prominent within, contracting the 

 aperture at thebase ; peristome widely reflected, 

 the right margin ilexuose, within thickened 

 Vertigo ventricosa. aud colorcd. Length, .07 inch; breadth, .015 



inch. (Morse.) 



Isthmia ventricona, Morse, Ann. N. Y. Lye, viii, 1, figs. 1-3 (Nov., 1865). 



Vertigo ventricosa, Morse, Amer. Nat., i, 669, figs. 61,62 (1868). — W. G. Binxey, L. & 

 Fr.-W. Sh., i, 253 (1869); Terr. Moll., v, 214.— Tryox, Amer. Jonrn. Conch., 

 iii, 310 (1868).— Gould and Binxey, Inv., 443, fig. 705 (1870). 



Maine, New Hampshire, aud New York ; a species of the Northern 

 Eegion. 



I have not seen this species. Mr. Morse says it has been con- 

 founded with V. ovata, but is one-fourth smaller, has one whorl less, 

 and a more circular columellar margin to the apertnie. 



Jaw wide, narrow, without median projection, but slightly curving 

 at ends; cutting edge regularly waived. 



Lingual formula 98 (13-1-13), with 6 perfect laterals; central and 

 Fic. 197. lateral bases of attachment ^j,, jyg 



,(?? 



t?^'^ "^ notched at outer lower cor- 



ners ; central square, hav- ^ ^ t- ,• 



Lingual membrane of Vertigo ventri- , ,,-..., /..;..,.. ^ /m,»,.^1 \ 



cosa. (Morse.) iug three small denticles: """"*■ <^""-e> 



indented at upper margin ; laterals tricuspid, inner <leiiticle largest ; 

 marginals minutely serrate. 



Eeferred to V. MouJinsiafia, Dnpn> , by Gwyn Jeffreys {I. c, 246). 



