232 



LAND AND FRESH-AVATER SHELLS OF N. A. [PART I. 



Stenogyra gracillinia, Pfr. — Shell imperforate, minute, elon- 

 gated, very slender, thin, of a drab-white color, ornamented with elevated, 

 compressed, sharp, rather distant, longitudinal ribs, of which there are 

 from twenty to thirty on each whirl, the interstices sculp- 

 tured by very crowded lines ; spire obtuse at the apex, and 

 composed of about eight flatlish whirls, the last of which is 

 about one-fourth the length of the shell, and somewhat 

 angular below the middle ; suture deeply impressed ; aper- 

 ture small, elongated, rhomboidal-ovate ; peristome sharp, 

 and somewhat pressed inward, so as to be parallel to the axis ; 

 the columella is straight, and joins the peristome at an angle, 

 BO as almogt to form a notch at the base of the aperture. 

 Length 7, diam. 1| ; aperture 2 mill, long, 1 wide. 



Achatina graciUima, Pfeiffek in Wiegm Arch. 1839, 1, 352. 



— BiNNEY, Terr. Moll. II, 293, pi. liii, f. 3. 

 Bulimus gracil/imvs, Pfeiffek, Symb. Ill, 54; Men. Hel. 



Viv. II, 160.— Reeve, Con. Icon. 594.— W. G. Binney, 



Terr. Moll. IV, 134. 

 Achatina striato-costata, D'Obbigny, Moll. Cub. I, 176, pi. xi, f. 19-21 ? 



Cuba, St. Thomas, and Florida ; also Bahamas. 



Spurious Species of Stenogyra. 



Stenogyra (Suhulina) octona, Chemnitz, has been found in greenhouses, 

 having been introduced on plants. 



PUPA, Db. 



Shell cylindrical, ovate or buliform, rimate or perforate ; la^t 

 whirl proportionally small ; aperture semioval or subrotund, 

 generally furnished with entering, fold-like denticles ; peristome 

 expanded or subsimple, margins equal, sub- 

 parallel, distant, usually connected with a 

 callous lamina. 



Jaw somewhat arcuate, furrowed with 

 delicate striae, its concave edge unbroken, 

 generally somewhat prominent in the middle. 



Jaw of Pupa corticaria. 

 [Morse.] 



