Species finely pointed, solid, striated annularly; generally rosy or pink colour.
D. rectum. The straight Tooth Shell.
Species entirely straight, with longitudinal ribs.
D. eburneum. The Ivory Tooth Shell.
Species of a reddish or pale yellow colour, with the tip frequently tinged with orange or pink.
FAMILY III.
Amphitritæa. Four genera.
The similarity of the four genera comprising this family is such, that it was thought sufficient to give only one type (the sabellaria crassissima), as the student may easily recognise the others.
1. Pectinaria. Two species.
A membranous or papyraceous tube, in the form of a reversed cone; unfixed; exterior covered with sandy adhesions.
Pectinaria Belgica.