3. Monodonta. Twenty-three species.
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.