HELTCIDiE. 49 



ened ; lips united by a tbin callus ; columellar lip subdilated. B. 

 Taunaysii^ Fer. 20 sp. South America. 



DRYPTUS, Albers, 1850. Shell rimate, ovate or ovate-oblong; 

 epidermis marbled, fuscous ; whorls 5-6, oblique, the last large, 

 ventricose, upper ones eostulate ; aperture oblong-ovate, colu- 

 mella twisted or plicate ; peristome scarcely thickened, expanded, 

 reflected, the margins joined by a callus. B. fulminans, Nyst. 

 (xcviii, 24). 20 sp. Northern South America. 



PACHYOTUS, Beck, 183t. (Chilonopsis, Fischer de Waldheim, 

 1848.) Shell perforate, oval, apex acute; whorls four or five, 

 the last ample, the upper ones usually plicate at the suture ; 

 aperture auriculiform ; columella tortuous ; peristome \ery wide, 

 thick, reflected. B. Sivainsoni, Pfr. (xcvii, 12). 8 sp. South 

 America. 



STROPHOCHEiLUS, Spix, 1821. (Coniclus, Albers, 1850.) Shell 

 subperforated, oval-oblong ; aperture oval or subauriculiform ; 

 columella tortuous, plicate above ; peristome widely reflected ; 

 the lips united by a thin callus ; columellar lip dilated, reflected, 

 B. Milleri, Sowb. ( xcvii, 15). 8 sp. Brazil. 



CARYODES, Albers, 1850. Shell solid, imperforate, oblong-oval ; 

 whorls five, plicate at the suture ; aperture oval, angular above, 

 half the total length ; peristome simple, obtuse ; lips united by 

 a callus ; columellar lip thickened, reflected. B. Dufresnii^ 

 Leach (xcix, 60). 4 sp. Australia, Tasmania. 



LEUCOTiENius, Albcrs, 1860. Shell perforated, ovate -acute, 

 thick; spire conical with rather obtuse apex; whorls seven, 

 planulate; columella straight, thickened, slightly receding; aper- 

 ture acutel}" ovate ; peristome simple, margins joined by a heavy 

 callus, columellar margin thickened, dilated and reflected. B. 

 Favannii, Lam. 3 sp. Seychelles, Madagascar. 



LiPARUS, Albers, 1850. Shell slightl}^ perforated, oval, conic; 

 spire a little obtuse ; whorls 6-8, the last three-fourths the 

 total length ; aperture oval ; peristome simple, sharp ; colu- 

 mellar lip narrow, dilated above and reflected. B. atomatua^ 

 Gray. 20 sp. Australia. 



PACHNODUS, Albers, 1860. Shell perforate, very rarely imper- 

 forate, ovate, conical, thin, striate or decussate ; apex rather 

 acute ; whorls 5-6^, the last ventricose, nearly the length of the 

 spire; aperture ovate or ovate-oblong; peristome simple, thin, 

 the columellar margin dilated, reflected, free. B. tumefactus^ 

 Reeve (xcix, 61). IT sp. Africa, Madagascar, Seychelles. 



OVELLA, Pfeifi'er, 1818. B. Socofrensis, Pfr. Socotora. 



RHAcms, Albers, 1850. (Achatinelloides, Nevill.) Shell per- 

 forated, oval or conical; whorls 5-8, the last sometimes angu- 

 lated ; aperture oval; peristome simple, sharp ; columellar lip 

 dilated, reflected, sometimes folded. B. pimctatus, Anton 

 (xcix, 62). 40 sp. E. and W. Africa, Mauritius, India, East 

 Indies. 



