This shell is found in the rivers of India, and is about an inch and
a quarter in length. All the species of this genus are supposed to
inhabit fresh water only. There is a curious fact attached to the
history of the Neritina, and of a neighbouring genus, Nerita,—namely,
that when found in a fossil state, their colours are always in good
preservation. The species, which are tolerably numerous, are in general
natives of hot climates.