248 AMPHITRITE. 
1. Fapricta.—Plate XXXI. Figs. 10, 11. 
A minute animal, dwelling on shores, bears so much resemblance to 
one denominated Fabricia by Miiller, in honour of a distinguished natu- 
ralist, that I shall not venture to assign it any other name. Fabricius, 
indeed, ascribes twelve segments to the body of his specimen, and Dr 
Johnston thirteen. Mine have had only six, whence, from that and 
other things, I cannot positively identify it with theirs ; and, before being 
aware of its having been observed by them, I had proposed to call it the 
Amphitrite palmata. 
This animal consists of a body composed of about six segments, 
crowned by a plume. Its total length about a line, and the expansion 
of the plume is as much. The latter consists of six compartments, each 
being a rib bordered by long tentacula, and each tentaculum fringed by 
cilia. Two black specks are on the neck. A bristle is on each side of 
the segments of the body. 
This animal dwells in a tube of its own fabrication, four lines long, 
and narrow. When the water is rendered turbid, the plume or branchiz 
may be observed protruding as a pencil from the tube, and particles are 
transmitted down the centre of the ribs, as the animal revolves like the 
Amphitrite. I have been unable, however, to discover tentacula within 
the plume, or trowels without it. 
Fabricius says that it cannot resume its place in the tube after 
having been dislodged. 
Specimens have survived four or five months in confinement, during 
which time the tube received sensible accessions. 
This animal dwells in pools near low water. As it is said that a 
later naturalist has named a different product Fabricia, Dr Johnston 
proposes that it shall be now denominated Othonia, thus still retaining 
the Christian name of Fabricius. 
Puate XXXII. 
Fic. 10. Fabricia. 
11. Another specimen. 
