442 A MANUAL OF AMERICAN LAND SHELLS. 



per ones well rounded and separated by a deep suture, tlie apex acute, 

 colored yellow, last whorl conical at its upper third ; aperture ovate, 

 rather more than half the length of shell, the columellar extremity of 

 the peristome somewhat incumbent; columella without a fold, rounded, 

 its edge above being seen winding far within the spire. Length, 

 12^"""; breadth, 6'"™. 



Succinea hileola, Gould, Proc. Bost. Soc. Nat. Hist., Juue, 1848, iii, 37; Terr. Moll., 



ii, 75, pL Ixvii, c, fig. 1 (1851).— W. G. Binney, Terr. Moll., iv, 41; v, 410; 



L. &, Fr.-W. Sli., i, 261 (1869).— Tryon, Am. Jouni. Conch., ii, 239, pi. ii, fig. 



30 (186(J).— Pfeiffkr, Moil. Hcl. Viv., iii, 16. 

 Succinea Texaftiatw, Pfeiffer, olim, Mon. Hel. Viv., ii, 526 ; in Eoemer's Texas, 45G 



(1849); ill Chemnitz, ed. 2, 4 J, pi. iv, 6^8.21-23 (1854). 

 Succinea citriiia, Hhuttleworth, lUKlescribed, teste Pfr. 



Florida and Texas, thus belonging to the Southern Eegion. 



Animal not observed. 



This species is very variable in its proportions, but is easily distin- 

 guished from our other species by its small aperture, elongated spire, 

 and its color, its golden interior in fresh specimens, instead of the 

 usual silvery luster, being its principal characteristic. Its characters 

 agree pretty well with a Mexican species described by Mr. Say under 

 the name of S. undulata ; and if any of our species were in view in that 

 description, it must have been this one. In form it most resembles S. 

 avara, but it differs in size and color. The shortest specimens resemble 

 S. campestris, but there is no fold of the columella. 



Succinea eflTiisa, Shuttleworth. 

 Shell depressed-oval, very thin, transparent and shining, lightly 

 nc. 487 striated, grayish horn-colored; spire remarkably short, acute; 

 whorls 2i, the last one very much the largest, dejiressed, equal- 

 ing five-sixths the length of the shell; columella scarcely 

 rounded and hardly receding; aperture very large, oblique, 

 s. cjnma. j^jj^i oval; peristome siuii)le, regularly rounding. Length, 

 12"""; diameter, 7""". Length of the aperture, 10"'"'; breadth, 6'"™. 



Succinea cffusa, Shuttleworth, MS.— Pfeiffer, Mon. Hel. Viv., iii, 17; in Chem- 

 nitz, ed. 2, 42, pi. iv, figs. 18-20 (lrt54).— W. G. Binney, Terr. Moll., iv, 41, 

 pi. Ixxx, fig. 12; v, 429; L. & Fr.-W. Sh.,i, 270 (1869).— Tryon, Am. Jourii. 

 Couch., ii, 231 (1866). 



East Florida; Spring Garden Lake, -Florida ; in the Florida Sub- 

 region. 



It is readily distinguished from the other American species by the 

 proportionally short spire, the very large body-whorl, and expanded 

 aperture. 



