152 SEAWEEDS 
(gametangium) on a short stalk surrounded by the 
end branches. In Botryophora there is also no 
incrustation, and the habit is similar but more lax, 
the plants being larger and the branches not so 
densely packed together. The sporangia are lateral 
and occur several together on the base of the 
branches. They contain a large number of spores with 
membranes, which may be gametangia, but no 
observation of their germination has been made. 
There is only one species, which was originally 
described under Dasycladus, and very probably that 
will prove to be its true position. Neomeris has an 
incrusted shoot of otherwise similar character to 
Dasycladus. The lateral branches bifurcate and end 
each in a swollen tip. These tips are arranged in 
rows of facets externally, forming a sort of outer 
cortex to the shoot. 
At the bifurcation of the lateral branches and 
between them, occupying morphologically the 
summit of the original lateral branch, there is a 
single oval sporangium, with one spore as to the 
development of which nothing is known. Bornetella 
differs from Neomeris in the branches being in two 
or three successive whorls and in the sporangia 
being of lateral origin, and containing several spores. 
Cymopolia is of very different habit since the main 
shoot, the axial cell, is repeatedly branched dichoto- 
mously. It consists of chains of cylindrical, incrusted 
portions, separated from each other by short, not 
incrusted, joints in which the branching has its 
origin. The apex of each branch has a terminal tuft 
of hairs like a brush. At the incrusted portions 
