338 A MANUAL OF AMElilCAX LA^D SHELLS. 



Succinea retusa, Lea, Trans. Am. Phil. Soc, v, 117, pi. xix, fig. ft6 (1837) ; Obs., i, 229. — 

 De Kay, N.Y.Moll., 55 (1843).— Pfeiffer, Mou.Hel. Viv., ii, 525.— Binney, 

 Terr. Moll.,iii, 65, C6.—W. G. Binney, Terr. Moll., iv, 37, pl.lxxix, fig. 7; v, 

 416; L. & Fr.-W. Sh.,i,250(1869).— Tryon, Am. Jouru. Conch., ii, 238 (1866). 



Succinea campestria, Anthony, Ohio Cat., uo descr., part (1843), No, 95. 



Interior Region, near Cincinnati. 



Mr. Lea's original description and figure are copied above. 



Jaw, lingual membrane, and genitalia not observed. 



Succinea ovalis, Gould, not Say. 



Shell ovate, somewhat conic, very thin, pellucid, watery horn-color. 

 Fig. 368. sometimes tinted roseate ; periostraca shining, very minutely 

 striate; whorls 3, the last compressed and elongate when 

 viewed above ; spire short but acute ; suture impressed ; 

 aperture produced by a deep truncation of the shell, elongated 

 s. ovalis. uiore than three fourths the length of the shell, patulous, ex- 

 panding anteriorly, exhibiting the interior of the volutions ; when 

 viewed on the side of the aperture the conical shape of the shell ap- 

 pears ; the broadest part of the cone is below the center of the aperture 

 and it tapers gradually to the apex. Extreme length, 15"""; of aper- 

 ture, 10'"". 



Succinea ovahi', Gould, Invertebrata, 194, fig. 125 (1841), ed. 2, 445 (1870).— Adams, 

 Shells of Vermont, 270.— Binney, Terr. Moll., ii, 78, pi. Ixvii, a, fig. 3.— \V. 

 G.'BiNNEY, Terr. Moll., iv,37; v, 417; L. & Fr.-W. Sh., i, 257.— Pfeiffer, 

 Mon. Hel. Viv., i, 814.— Morse, Jouru. Portl. Soc., i,30 fig., 77; pi. ix, fig. 

 78 (1864); Amer. Nat., i, 607. fig. 48 (1868).— Tyron, Am. Journ Conch., ii, 

 237 (1866).— Not of Say. 



Succinea Decampii, Tryon, Am. Jouru. Conch., ii, 237, pi. ii, fig. 23 (1866). 



Succinea Calumeieiisis, Calkins, Valley Naturalist (a newspaper), i, No. 2, 1, fig., Saint 

 Louis, November, 1878 



Canada and the Northern and Middle States, thus belonging to both 

 Northern and Interior Eegions. 



Animal a little longer than the shell, whitish or amber-colored and 

 translucent, with minute black dots, scattered and in clusters of dots, 

 upon the surface, most frequent upon the head and upper part of neck. 

 Foot free from dots. A black line running from the ocular points of 

 the eye-peduncles through their length and along the sides of the neck 

 to the shell, marking the sheath of the eye-]ieduncles, which are rather 

 short, thick at base, attenuated towards the end, bulb distinct; tenta- 

 cles short, small, and rather conical. Respiratory cleft near the peri- 

 stome of the shell, about midway between its center and its junction 

 with the last whorl. 



