greenish. The substance is very soft and thin ; and in drying the plant 

 adheres very firml to paper. 



Since the publication of the memoir on Western Austrahan 

 Algae, quoted above, I have received much more perfect speci- 

 mens of this beautiful species from my often-mentioned corre- 

 spondent, Mr. Clifton, and I am therefore induced to alter the 

 trivial name formerly given, and which was suggested by the 

 imperfect specimens first seen. 



The habit and substance of the frond are those of the mem- 

 branous HaJi/menia ; and the fructification (unfortunately omitted 

 in our Plate) is not dissimilar. But the cellular structure of 

 the membrane is a little different from its typical condition in 

 Halymenia, not sufficiently so however to warrant a removal 

 from that natural and somewhat diversified group of Algae. 



Halymenia Floresia, of very large size, has been found by Mr. 

 Clifton near Fremantle. The specimens collected there by me 

 were poor and few. Those sent by Mr. Chfton are among the 

 most luxuriant examples I have seen of this widely distributed 

 and beautiful plant. 



Pig. 1. Halymenia Cliftoni, — the natural size. 2. Thin slice, to show 

 internal structure, — magnified. 



