This genus occupies an intermediate space between the Trochus and the
Turbo; distinguished from the former by the aperture being more round
and slightly depressed, and from the latter by the toothlike projecting
angle which the truncated columella occasions at the base of the
aperture.
Shell ovate or conoid, aperture round and entire, with an operculum;
outer lip disunited from the body at the top; columella arched and
truncated at the base.
Monodonta bicolor.
M. pagodus.
M. tectum Persicum.
M. papillosa.
M. coronaria.
M. Egyptiaca.
M. carchedonius.
M. tectum.
M. labio.
M. Australis.
M. canalifera.
M. viridis.
M. fragarioides.
M. constricta.
M. modulus.
M. articulata.
M. lugubris.
M. punctulata.
M. tricarinata.
M. canaliculata.
M. Seminigra.
M. rosea.
M. lineata.
_M. coronaria._ The crowned Monodonta.
Species in which the columella greatly projects, and the spire is
entirely flat; covered with numerous small tubercles; colour white; the
columella tinged with red.
_M. labio._ The double-lipped Monodonta. Pl. 23, fig. 2.
Species sub-globular, umbilicated, spiral whorls rounded; the columella
terminated by a tooth.
_M. fragarioides._ The strawberry-shaped Monodonta.
Species more or less globular, of which the columella, almost straight,
offers but a little obstacle to its junction with the margin.