192 
Blackman and Tanslcy. 
with the angles continued into arms. Chromatophore 
one in each semi-cell, consisting of a central body 
with a pyrenoid and diverging plates, of which two run 
Darallel into each angle. 
19 . Pleuventerium. Lundell, 1871 . 
Like Staurastruin, but with parietal chromatopores, each 
containing several pyrenoids. 
Sub-Family III. Filamentae. 
Cells always united by their ends to form filaments. 
20 . Spondylosium. Brebisson, 1845 . 
Cells roughly oblong, with rounded or straight ends, oval 
or triangular in end-view. Chromatophore axile, con¬ 
sisting of a central body containing a pyrenoid, and 
four or six diverging plates in each semicell. 
21 . Onyciionema. Wallich, i 860 . 
Cells Battened, with a deep equatorial constriction. 
Semi-cells oval or kidney-shaped, with two processes 
by which the cells are connected into slightly curved 
threads. Chromatophore of four plates diverging 
from a pyrenoid in each semicell. 
(To be continued .) 
R, MADLEY, Printer, 151, Whitfield Street, W. 
