The shells of this genus are fluviatile, and distinguished from the
Melania by having the upper part of the columella callous.
Shell oval or slightly sub-turriculated; aperture oval, without trace of
tube, but hollowed anteriorly, without a posterior sinus; the columellar
edge callous and rather deeply excavated; operculum horny, sub-spiral,
rather complete.
Melanopsis Buccinoides.
M. costata.
M. lævigata.
_M. Buccinoides._ The Buccinum-shaped Melanopsis. Pl. 20, fig. 6.
Species turriculated; colour bluish white, clouded with purple; spiral
whorls dentated.
_M. costata._ The ribbed Melanopsis.
Species sub-turriculated and ribbed.
_M. lævigata._ The polished Melanopsis.
Species ovate, smooth, chestnut colour.