I have not been able to ascertain the exact structure :—the 
radiated appearance shown in the truncated ends of the mag- 
nified filaments, is only ¢zferred from the striated surface, which 
the endochrome presents to a high magnifymg power. Whether 
these striae are caused by shrinking of the membrane in drying, 
or whether they are really (as [ have supposed) the exterior faces 
of slender radiating cells, cannot be determined without an 
examination of a fresh specimen. 
[ have not seen any specimen from Captain Carmichael, and, 
therefore, am unable to assert the identity of what I now figure 
with his plant. My specimens* do not show the running together 
of the endochrome into a sporidium as he describes, and the 
articulations, though sometimes short, are more usually twice as 
long as their diameter. 
This plant is referred to Bangia, at the suggestion of 
M. Chauvin. I do not think it strictly accords with the proper 
structure of that genus; but it may remain in that convenient 
receptacle until its true structure is fully made out. Should it 
eventually be made the type of a new genus, I fear Kiitzing’s 
Goniotrichum can scarcely be adopted, because he confounds 
under that name both Bangia? elegans, Chauv., and Bangia 
ciliaris, Carm., two very distinct plants, and the latter a true 
Bangia. 
Fig. 1. Tufts of Banaia? CERAMICOLA, growing on an old piece of P. ni- 
grescens :—the natural size. 2. Portions of four filaments, showing the 
variations of size and length of joints. 3. An empty filament :—the two 
last figures very highly magnified. 
* While this sheet is passing through the press, I have received from Mr. 
Landsborough a specimen which shows the commencement of the fruiting 
process described by Carmichael, and in which the articulations are shorter than 
in the specimen I have figured. I no longer entertain any doubt of the identity 
of Carmichael’s and my plants. 
