of these plants, and, I hope, to discriminate between them. 

 E. Landsburgii is not only more thorny in aspect, but is of a 

 far more rigid substance, and much less transparent : nor does 

 it grow in large densely interwoven tufts like E. distortus. 

 Both species appear to be of rare occurrence. 



The figure now given has been prepared partly from an 

 original drawing by Carmichael, and partly from one of his 

 specimens. 



Pig. 1. Tuft of Ectocarpus distortus : — the natural size. 2. Portion of a 

 filament, to show the branching: — magnified. 3. Small fragment of the 

 same : — highly magnified. 





