ACHATINID^. 61 



RUMiNA, Risso, 1826. (Orbitina, Risso, 1826. Cylmdriua, 

 Schliitt., 1838.) Shell turriculated, the adult always truncate; 

 whorls numerous, plane, with moderately impressed suture ; 

 aperture small, oval, the peristome slightly thickened, its 

 extremities united by a slight callus. 



S. decollata, Linn, (xcix, 82, 83), is a native of the Mediter- 

 ranean region of Europe ; it is acclimated at Charleston, S. C. 



CLAVATOR, Martens, 1860. Shell turreted-conical, not shining; 

 flavously striate ; peristome simple, obtuse. S. clavator, Petit. 

 2 sp. Madagascar. 



OPEAS, Albers, 1850. Shell thin, umbilicated or imperforate, 

 usually small, subulate, covered with striae or small ribs ; aper- 

 ture oval-oblong ; peristome simple, columellar lip reflected. S. 

 octoiioidea, Ads. (xcix, 84). 63 sp. West Indies, Java, etc. 



spiRAXis, C. B. Ad., 1850. Shell elongated, acuminate, very 

 finely longitudinally striate ; columella tortuous ; peristome 

 siimple. 44 sp. India, China, West Indies, Mexico, Central 

 America. 



Uuspiraxis, Pfr., 1855. Turreted, thin, striulate or costulate, 

 shining ; whorls 6-9, rather flat ; aperture ovate-oblong, one-third 

 to one-half the total length ; peristome simple, acute. S. 

 aberrans, Pfr. (xcix, 85). 



Nothus, Albers, 1850. Shell imperforate, oblong-conic, thin, 

 diaphanous ; whorls six or more, the last about the length of 

 the spire ; columella short, doubly tortuous ; columellar lip 

 reflected ; aperture small, semioval ; peristome simple. 8. 

 Salleana, Pfr. 



Lamellaxis, Streheleiud Pfeffer, 1882. S. Mexicanus, Pfeitfer. 



SUBULINA, Beck, 1837. (Macrospira, Swains., 1840.) Shell 

 diaphanous, cylindrical, turriculated or conic-elongated, with 

 obtuse summit ; whorls numerous, slowly increasing in size; aper- 

 ture oval, short, columella subarcuated and obliquely truncated at 

 base ; peristome sharp. S. sulcatus^ Gray (xcix, 86, reversed in 

 error). 90 sp. India, E. and W. Africa, West Indies, Mexico, 

 Central America. 



Glandinella, Pfeiffer, 1818. S. Poeyanus, Pfr. Isle of Pines, 

 near Cuba. 



GLESSULA, Albers, 1860. (Electra, Albers, 1850. ) Shell ovate- 

 oblong, thin, diaphanous ; spire pyramidal, apex obtuse ; whorls 

 numerous, the last inflated ; columella short, arcuated, abruptly 

 truncated. G. Geylonica^ Pfr. (xcix, 89). 59 sp. India, East 

 Indies, W. Africa. 



MELANiELLA, Pfeiff'er, 1859. Shell imperforate, coetate, decus- 

 sated ; brownish horn-color ; whorls nine, slightly convex, 

 gradate; aperture effuse at base, ovate; columella strict; 

 peristome simple, subcontinuous. S. acuticostata, d'Orb. (xcix, 

 8*1). 8 sp. Cuba, Trinidad, Florida. 



