G. SALACIA, 
93 
here to rocks or other solid bodies by interwoven hol- 
low fibres, which sometimes form a mass of an inch 
in diameter; they are never parasites on marine 
plants. 
FISH-LIKE. 
1. Thoa halecina. Cells scarcely any; two arti- 
culations at their base; ovaria oval, irregular, and 
solitary. 
European seas. 
SAVIGNI’S. 
2. Thoa Savignii. Ovaria in clusters, rarely iso- 
lated. — Plate 6. fig. 2. a. B. C. 
Mediterranean. 
SALACIA. 
Plant-like and articulated ; cells long, cylin- 
drical, and in united formation to the number of four ; 
their openings verticillated on the same line ; ovaria 
oval and truncated. 
The stem is compressed, slightly flexuous, stiff 
and brittle, as is the whole Polypidom ; it supports 
branches formed of long cylindrical cells, four to- 
gether in united formation, having their openings on 
the same line, as if verticillated, and a little projecting : 
this opening frequently appears situated at the side of 
the tubes. 
