DESCRIPTIONS OF PLATES. 295 



PLATE XII. 



ILLUSTRATIVE OF A PAPER, BY W. H. HARVEY, M.D., F.L.S., ON NEW 

 BRITISH ALGiE. 



Fig. 



1a. Leathesia crispa, growing on Chondrus crispus, the natural size. 



2a. Part of a filament, with its curled apical ramelli, magnified. 



3a. Ramellus and spore, more highly magnified. 



1b. Elachista Grevillii growing on Cladophora rupestris, the natural size. 



2b. Portion of the tuft magnified. 



3b. Apex and base of a filament more highly magnified. 



Vide page 201. 



