84 
CLASS I.— ORDER II. 
SHINING. 
12. Sertularia splendens . Stem branching and 
articulated ; two cells, alternate at each articulation ; 
cells nearly cylindrical ; opening with three teeth, the 
one on the external border much longer than the side 
ones ; ovaria nearly cylindrical ; height from two to 
four centimetres. 
Bay of Cadiz. 
SHRUBBY. 
13. Sertularia arbuscula. Root forming a large 
base ; stem thick, short, and branching from its base ; 
branches and shoots numerous, short, and scattered : 
cells small, campanulated, bulging, and entire at 
their border ; ovaria long and oval, with a small open- 
ing at the summit; colour deep brown; height from 
four to six centimetres. — Plate 5. fig. 4. a. B. C. 
Seas of Australasia. 
CYPRESS. 
14. Sertularia cupressina . Cells tubular and 
adhering through all their length ; external border of 
the opening higher than the inner. 
European seas. 
SILVER. 
15. Sertularia argentea. Cells pyriform ; branches 
alternate and panicled. 
Seas of England and America. 
ARBOR VITJE. 
16. Sertularia thuja. Cells in two rows and 
