Distinguished from the Cerithium by having a notch or slit in the right
margin.
Shell fusiform, rather rugged, spire turreted; aperture ovate, small,
terminated by a canal variable in length; the right edge sharp, more or
less notched; operculum horny.
Pleurotoma imperialis.
P. auriculifera.
P. muricata.
P. echinata.
P. fascialis.
P. bimarginata.
P. buccinoides.
P. cingulifera.
P. flavidula.
P. interrupta.
P. crenularis.
P. cincta.
P. unizonalis.
P. lineata.
P. spirata.
P. virgo.
P. Babylonia.
P. undosa.
P. marmorata.
P. tigrina.
P. crispa.
P. albina.
P. nodifera.
_P. Babylonia._ The Tower of Babel Pleurotoma. Pl. 24, fig. 1.
Species in which the tube is rather long, and the notch is a little
posterior to the middle of the edge.
_P. auriculifera._ The eared Pleurotoma.
Species in which the tube is short, and the notch entirely against the
spire.
_P. nodifera._ The knotty or Javanese Pleurotoma.
Species with outer lip largely notched and deeply crenulated; upper
volution smooth; under volution and body striated transversely, with
angulated oblique nodules at the suture; colour reddish yellow.