ACHATINIDA. 59 
Corona, Albers, 1850.. Shell usually sinistral, oval-oblong 
spire elongated, subturreted, summit obtuse ; whorls eight, tie 
last two-thirds the total length ; aperture semioval ; columella 
tortuous, plicate, callous above, slim at the base, truncate ; 
peristome simple, sharp; outer lip uniting with the columella 
atasharp angle. O. regina, Fer. 
Orthalicinus, Crosse and Fischer, 1875. O. fasciata, Mull. 
(xeviii, 39). Cuba, Florida. 
Calycia, Adams, 1865. O. crystallina, Reeve. Waigiou, 
Malay Archipelago. 
Licuus, Montfort, 18!0. (Chersina, Beck [pt.], 1837. Pseudo- 
trochus, Mirch, 1852.) Shell imperforate, solid, elongately 
conical, apex acuminate, variously fasciate with gay colors ; 
whorls ie 8, the last about one-third the total length ; columella 
straight, in the adult distinctly truncate ; aperture lunately oval, 
subangulate ; peristome simple, acute, the inmargins joined by an 
entering callus. O. virginea, Linn. (xcviii, 40’. 6 sp. West 
Indies. 
Porphyrobaphe, Shuttl., 1856. Shell imperforate, oblong, 
solid, usually plicately striate, apex obtuse ; whorls 6-8, the last 
ventricose ; columella thick, plicately twisted ; aperture oblong- 
oval; peristome thickened, expanded-reflected, margins united 
by a thin callus. O.ztostoma, Sowb. 12 sp. So. America. 
Famity ACHATINID &. 
» Shell moderately thick, with more or less elongated spire ; the 
last whorl generally ventricose ; aperture large ; columella trun- 
cate at the base; peristome usually simple, sharp. 
Jaw finely plicate or costulate, thin; central tooth very small, 
laterals tricuspid, with the central cusp much the longest, mar- 
ginals short, tricuspid. 
AcHaATINA, Lam., 1799. 
Etym. —Agate-shell. 
Syn.—Cochlitoma, Fer., 1819. Onca, Gistel, 1848. 
Distr.—i3 sp. ‘Mostly African; arboreal. A. zebra, Chemn. 
(xeviii, 43). 
Shell oblong-oval, with conical spire, very rarely turricu- 
lated, sometimes sinistral; whorls 6—9, the last more or less 
ventricose ; columella tortuous, arcuated, truncate below; aper- 
ture oval, expanded below, sharply angulated behind ; peristome 
sharp ; lips united by a more or less callous shining deposit. 
The Achatini are the largest of all land-shells, even exceeding 
the great Bulimi of the Borus group which replace them in the 
similar latitudes of South America; like them, the eggs are 
large, with a calcareous shell, being over an inch in length. 
Homorus, Albers, 1850. Imperforate, turreted, apex obtuse, 
