This likewise is an elegant genus of shells, classed by Linnæus with the
Bulla. They are the largest land-shells known, and greatly resemble the
Bulimus, but never have their lips reflected or thickened. Sometimes the
last whorl is compressed and attenuated at the base, and sometimes
ventricose and not compressed.
Shell in form very variable, but generally sub-turriculated, ventricose,
striated longitudinally; the summit papillose; aperture a little
variable, but never thickened or reflected; the right edge always acute,
the columellar margin rather strongly hollowed, entirely formed by the
columella, of which the anterior extremity is constantly open and
truncated.
Achatina perdix.
A. zebra.
A. acuta.
A. bicarinata.
A. Mauritiana.
A. castanea.
A. glans.
A. Peruviana.
A. albo-lineata.
A. fusco-lineata.
A. immaculata.
A. purpurea.
A. ustulata.
A. vexillum.
A. Virginea.
A. Priamus.
A. fulminea.
A. columnaria.
A. folliculus.
A. acicula.
_A. Virginea._ The Virginian Achatina.
Smooth, conoid, with aperture almost round; very short, grayish white,
with red and black transverse bands; columella rose-coloured, with one
plait; volutions ventricose; inside of the lips bluish; a transverse
callosity in the interior.
_A. zebra._ The zebra Achatina. Pl. 18, fig. 1.
Species thin, oval, sub-ventricose, spire prominent, striped like a
zebra.
_A. glans._ The acorn Achatina. Pl. 18, fig. 2.
Species sub-turriculated, of which the last whorl is attenuated
anteriorly.
_A. columnaris._ The columnar Achatina. Pl. 18, fig. 3.
Species evidently turriculated.