often mentioned in the pages of this work, who has added so 

 many original observations on the British Algae to the common 

 stock, and has been the first to notice so many new species. 

 More recently this plant has been gathered on the shores of 

 Heligoland in the Baltic, and also on the northern coasts of 

 France. It is nowhere very common. 



Fig. 1. Mesogloia Griffithsiana : — the natural size. 2. A portion of a 

 branch: — slightly magnified. 3. One of the colourless fibres. 4. Trans- 

 verse section of the stem. 5. A spore and one of the filaments of the 

 periphery : — all more or less highly magnified. 



