British Marine Algae. 315 
15 n in diameter. Very frequently the filaments which contain 
these abnormal cells are curved in a falcate manner or even 
rolled up into a nearly spherical mass. 
The zoospores are formed in slightly enlarged cells hardly 
differing in appearance from the ordinary vegetative cells. 
When the young plant first appears it is generally rolled up 
in a ball ; at a later period the end of the filament grows out 
at a tangent, and branches are then given off in all directions. 
The endochrome appears to be applied to the walls of the 
cells in an almost unbroken layer. 
In my note 1 on the genus Tellamia , I have referred to 
this genus, under the name Tellamia intricata , another Alga 
that usually accompanies Tellamia contorta and appears to be 
equally common. This plant, which is perhaps more closely 
related to Endoderma than to Tellamia , is much more slender 
than the plant above described, being seldom more than 3-5 /x 
in diameter, and is never interwoven into such compact 
masses as that species. The filaments are branched in 
a rather irregular way, opposite alternate or secund. In 
nearly every case the cells are longer than broad, but they 
vary very much in length ; generally they are from 3-15 /x 
long, but longer cells are not uncommon ; the diameter of the 
filaments varies from 2-5-4* 5 1 x, occasionally the branches 
anastomose. No enlarged cells like those of Tellamia contorta 
were observed. Zoospores are formed in enlarged cells about 
6/x in diameter. In this species the chromatophore nearly 
fills the entire cell, and is composed of an irregularly shaped 
layer broken here and there, and contains a single pyrenoid. 
The colour of the plant is yellowish green often almost brown. 
The genus Tellamia belongs to the Chaetophoraceae, and must 
be placed near the genus Endoderma. The genus may be 
thus characterised. 
Tellamia. Thallus minute, consisting of radiating, irregu- 
larly branched, jointed, creeping filaments, living in the 
periostracum of mollusca ; cells of the filaments often swollen 
and distorted. Zoospores formed in slightly enlarged cells. 
1 Annals of Botany, Vol. ix, p. 169. 
Z 
