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. 



SAVIGNFS. 



2. Thoa Savignii. Ovaria in clusterff, 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. 



