Species incrusted with small stones; sometimes found thick and of a large size.
3. Terebella. Three species.
Tube elongated, cylindrical, membranous, attenuated and pointed at the base, with adhesions of sand.
Terebella conchilega.
T. cristata.
T. ventricosa.
T. conchilega. The shelly Terebella.
Tube covered with numerous fragments of broken shells.
4. Amphitrite. Six species.
Nearly the same as the Terebella, but of a tougher membranous texture, and generally without adhesions.