often situated in a forking of the branch, and generally in one of the upper- 
most forks, subtended by a few short ramuli. etraspores prominent, 
forming a whorl round the joint, in the upper (but not ultimate) divisions 
of the filament. Colour a dark purplish-red. Substance delicately mem- 
branaceous and soft. In drying the plant closely adheres to paper, and 
has a peculiar glassy lustre, especially in the colourless portions of the 
thread. 
RRRRADRAARADAN Dn rn 
A beautiful species, and a éolerably definite one, considering 
the genus to which it belongs! It is known from C. nodosum 
by its less patent branching, its more purple colour, and dif- 
ferent disposition of the tetraspores, besides minor characters, 
more readily taken in by the eye than the ear. Sometimes the 
branches are found quite smooth, and at other times every node 
of the upper branches and ramuli is densely clothed with long, 
flexible hairs, which ‘appear to be the same pubescence that 
Kiitzing describes, and on the presence of which he founds his 
genus Zichoceras. At first, on noticing these hairs, abundantly 
clothing a specimen sent by Miss Turner from Jersey, I was 
disposed to regard them as a specific character, and to suspect 
that I had before me Zrichoceras villosum of Kiitzing. Whether 
this be so or not, I soon abandoned all thoughts of grounding 
a species bn the presence or absence of such hairs, for I found, 
on examining numerous splendid specimens sent to me by Mr. 
Boswarva and Dr. Cocks, that nothing could be more inconstant ; 
branches from the same tuft differing in the degree of hairiness, 
and specimens from the same locality, and identical in all other 
characters, being some hairy, some perfectly smooth. Lastly, 
on re-examining my original Dingle specimens, which had been 
acknowledged by Kiitzing himself to be truly his C. strictum, I 
found traces of similar pubescence. And such hairs are by no 
means restricted to this species, but occur on C. rubrum, and pro- 
bably on most other species. ‘They are, I suspect, organs of the 
same nature as the fidrille of Polysiphonia, and if this be the 
case we may expect to find axtheridia on them. 
Vig. 1. Ceramium strictum :—the natural size. 2. Portions of two filaments, 
one hairy, the other smooth. 8. Part of a branch, with a favella. 4. Part 
of a branch, with ¢e¢raspores in situ. 5. Apex of a branch, partially clothed 
with hairs. 6. A hair. 7. An articulation of the lower part of the fila- 
ment :—all the latter figures more or less highly magnified. 
