The covering of the animal belonging to this genus is composed of
fragments and particles of marine substances, adhering to a tubular
membrane; some are detached and others are fixed. The tubes are cellular
at the base, and the orifice expanded.
Sabellaria alveolata.
Sabellaria crassissima.
_S. alveolata._ The Honeycomb Sabellaria.
Consists of numerous parallel tubes, nearly straight, communicating by
an aperture, forming when in mass the appearance of a honeycomb; it
adheres to rocks in clusters.
_S. crassissima._ The very thick or strong Sabellaria. Pl. 33, fig. 2.
Species incrusted with small stones; sometimes found thick and of a
large size.