F. Borgesen: Phæophyceæ o! the Danish W. Indies. O 



Siboga", I, 1913, p. 130) and to Ectocarpus simpliciusculus of 

 Askenasy (Alg. Gazelle, p. 20, tab. V, fig. 1, 11) which, as pointed 

 out by M me Weber, most probably belongs to Ectocarpus indicus. 

 M me Weber does not mention the shape of the chromatophores of 



Fig. 2. Ectocarpus Duchassaingianus Grun. 

 a, basal, creeping filament, b, filament with a long, cylindrical plurilocular 

 sporangium and unilocular sporangia, c, plurilocular sporangia placed upon 

 the main filament, d, plurilocular sporangia upon a branchlet. e, a terminal, 

 plurilocular sporangium, f, an unilocular sporangium, g, cell with chromato- 

 phores. {a, about 50 : 1 ; b~e, about 90 : 1 ; f, about 140 : 1; g, about 225 : 1). 



Ect. indicus ; if these agree with those of Ect. Duchassaingianus 

 I think the latter is merely a form of the former. 



