HELICID. 49 
ened; lips united by a thin callus; columellar lip subdilated. B. 
Taunaysti, Fer. 20 sp. South America. 
pryptus, Albers, 1850. Shell rimate, ovate or ovate-oblong ; 
epidermis marbled, fuscous ; whorls 5-6, oblique, the last large, 
ventricose, upper ones costulate; aperture oblong-ovate, colu- 
mella twisted or plicate; peristome scarcely thickened, expanded, 
reflected, the margins joined by a callus. B. fulminans, Nyst. 
(xeviii, 24). 20sp. Northern South America. 
pacHyotus, Beck, 1837. (Chilonopsis, Fischer de Waldheim, 
1848.) Shell perforate, oval, apex acute; whorls four or five, 
the last ample, the upper ones usualiy plicate at the suture; 
aperture auriculiform ; columella tortuous ; peristome very wide, 
thick, reflected. B. Swainsoni, Pfr. (xevii, 12). 8 sp. South 
America. 
STROPHOCHEILUS, Spix, 1827. (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, Sowhb. (xevii, 15). 8 sp. Brazil. 
cAryopEs, 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). 4sp. Australia, Tasmania. 
LEUCOTNIUs, Albers, 1860. Shell perforated, ovate-acute, 
thick; spire conical with rather obtuse apex; whorls seven, 
planulate; columella straight, thickened, slightly receding; aper- 
ture acutely ovate; peristome simple, margins joined by a heavy 
callus, columellar margin thickened, dilated and reflected. J. 
Favannii, Lam. 3sp. Seychelles, Madagascar. 
LIpARUS, Albers, 1850. Shell slightly 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. 5. atomatus, 
Gray. 20 sp. Australia. 
PACHNODUS, Albers, 1860. Shell perforate, very rarely imper- 
forate, ovate, conical, thin, striate or decussate; apex rather 
acute; whorls 5-64, 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). 17 sp. Africa, Madagascar, Seychelles. 
OVELLA, Pfeiffer, 1878. B. Socotrensis, Pfr. Socotora. 
RHACHIS, 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. punctatus, Anton 
(xcix, 62). 40 sp. E. and W. Africa, Mauritius, India, East 
Indies. 
