for no notice had been taken of Miss Hutchins's specimens in 

 ' Eng. Bot/; and no other observer had collected the plant until 

 Mrs. Griffiths, in 1833, gathered the specimens which were 

 described by me. 



In the account which I first published respecting it, I regarded 

 it as more nearly allied to Ectocarpus than to any other genus, 

 an opinion to which I still adhere, although Endlicher has placed 

 it nearer to Cladosteplms, to which its quadrifarious ramuli bear 

 some resemblance. In the long hyaline fibres which plentifully 

 cloth it in every state, it is distinct from both. These fibres I 

 formerly described as being forked ; on a more careful examina- 

 tion I cannot detect this character. They appear to issue indis- 

 criminately from the apices, and the lateral sides of the ramuli. 



In the outline of the frond there is much resemblance to Dasy- 

 cladus clavaformis, a curious Mediterranean Alga belonging to 

 Siphonece ; but the structure is very widely different. 



Fig. 1. A frond of Chorda lomentaria infected with tufts of Myriotrichia 

 claVjEformis : — the natural size. 2. A tuft of Myriotrichia clavaformis. 

 3. Two fronds, of different ages. 4. A section showing a utricle, subtended 

 by a ramulus, and some of the hairs which clothe the latter : — all mare or 

 less magnified. 



