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

Tube testaceous, spirally twisted on a horizontal plane, with terminal aperture rounded or angular, attached by the lower part to marine substances.

Spirorbis Nautiloides.

S. spirillum.

S. carinata.

S. lamellosa.

S. tricostalis.

S. Nautiloides. The Nautilus-shaped Spirorbis.

White, transversely wrinkled and minute.

2. Serpula. The Worm Shell. Twenty-six species.

The name of this genus is derived from the Latin word serpo, to creep, on account of the vermiform character of some of its species.