334 



A MANUAL OF AMERICAN LAND SHELLS. 



behind and a thickening within ; aperture in general outline semicir- 

 cular, the curve consisting of segments of two different-sized but well- 

 FiG. 362. defined circles, the smaller on the right at the junction of 

 the peristome and body-whorl, comprising about one-fourth 

 of the whole contour, and forming an angle at their junc- 

 tion ; teeth generallj^ G, two on the tranverse margin, two 

 on the columellar margin, the upper of which is massive, 

 the lower pointed, and two on the peristome, in the base 

 and at the junction of the two curves, sharp and promi- 

 nent; umbilicus expanded. Length, S'""" ; diameter, H"""; aperture, 

 1'"'" long. 



Vertigo ovata, Say, Joiirn. Acad. Nat. Sci. Phila., ii, 375 (1822); ed. Binney, 26.— 

 BiNNEY, Terr. Moll, ii, 334, pi. Ixxi, fig. 4. — W. G. Binney, Terr. Moll., iv, 

 148; V, 210; L. & Fr.-W. Sh., i, 253 (1869).— Morse, Amer. Nat., i, 668, figs. 

 57, 58 (1868).— Tryon, Amer. Journ. Conch., iii, 310, 22, (1868).— Gould and 

 Binney, Inv., 442, fig. 704 (1870). — Fischer and Crcsse, Moll. Mex. et Guat., 

 310 (1870). 



Vertigo tridentafa, Wolf, Am. Jonru. Couch., v, 198, pi. xvii, fig. 1. 



Piqm ovata, Gould, Best. Journ. Nat. Hist., iv, 350, pi. xvi, figs. 7, 8 (1843).— De Kay, 

 N. Y. Moll., 50, pi. iv, fig. 50 (1843).— Adams, Vermont Mollusca, 157 (1842); 

 Sillimau's Journal [i], xl, 271.— Kuster, in Chemnitz, ed. 2, 118, pi. xiv, 

 figs. 1, 2; XV, figs. 35, 38.— Pfeiffer, Mon. Hel. Viv., ii, 360; Symbolfe, ii, 

 54. 



Pupa modesta, Say, Long's Exped., ii, 25, pi. xv, fig. 5 (1824) ; ed. Binney, 32, pi. Isxiv, 

 fig. 5.— Gould, Invertebrata, 189, fig. 119 (1841). 



Pupa ovulum, Pfeiffer, olim, Symbolje, i, 46. 



Isthmia ovata, Morse, Journ. Portl. Soc, i, 38, fig. 93; pi. x, fig. 94 (1864). 



Over all the Eastern Province, having been found from Maine to 



Texas : also in the Central 



Fig. 363. 



Province, in Arizona. For its 

 presence in Europe see Jen- 

 sen, Bidr. til Kristianiafjor- 

 den Moll., 6S, 80. Also 

 quoted from Mexico and 

 Cuba. 



Jaw arcuate, of uniform 

 breadth, ends square and hor- 

 izontal ; anterior surface with 

 longitudinal wrinkles ; con- 

 cave margin simple, with a 

 median projection. 

 Lingual membrane with 90 rows of 29 teeth (14-1-14), 9 perfect laterals ; 

 centrals and laterals tricuspid, marginals serrated (Figs. 359, 360, i).332). 



Vertigo ovata. 



