A Manual of Conchology / According to the System Laid Down by Lamarck, with the Late Improvements by De Blainville. Exemplified and Arranged for the Use of Students.

by Thomas Wyatt

Species with a canal much smaller, but entirely straight, and a sinus well formed at the posterior union of the two edges.

C. semigranosum. The semi-granulated Cerithium.

Fusiform, turreted; apex acute; the suture with double spiral rows of large granules; minutely striated transversely, with sulcated granulations; colour reddish brown.

2. Pleurotoma. Twenty-three species.

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.