MARINE ALGiE. 



71 



LXXVII. Nemaleon. 



Frond filiform, gelatinous, cartilaginous, elastic, solid. 

 Fructification, globular masses of spores (favellidia) at- 

 tached to the filaments of the periphery. 



1. Nemaleon multifidum. 



2. „ purpureum. 



LXXVIII. DlJDRESNAIA. 



Frond cylindrical, gelatinous, elastic. Fructification : 

 — 1. Globular masses of spores attached to the filaments 

 of the periphery ; 2. External tetraspores borne by the 

 filaments of the periphery. 



1. Dudresnaia coccinea. 



2. Hudsoni (divaricata). 



LXXIX. Crouania. 



Frond filiform, consisting of a jointed, single-tubed 

 filament, whorled at the joints with minute multifid 

 ramelli. Fructification, tetraspores attached to the 

 base of the ramuli. 



1. Crouania attenuata. 



