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

R. pisolina.

R. aspera.

R. morus.

R. mutica.

R. horrida. The horrid Ricinula. Pl. [26], fig. 2.

Species without a canal; exterior covered with strong, obtuse black tubercles, with the interstices white, striated transversely; interior rich purple colour; outer lip with five triangular grooved radii, between which at their base the margin is crenulated.

R. digitata. The digitated Ricinula.

Species canaliculated; two long palmated digits at the side of the aperture.

4. Purpura. Fifty species.

This genus has its name from the purple liquid produced by the animal, from which the ancients extracted the Tyrian purple dye. This is the last genus that presents the appearance of a canal at the base of the aperture, and therefore rightly precedes the remaining genera of this family, all of which are without a canal.