FT7CUS. 



281 



Mount in sea- water some of the orange slime, and note 

 that it contains numerous ellipsoid aiitheridia ; each an- 

 theridium contains numerous antherozoids, and each 

 antherozoid is a pear-shaped cell with a bright orange 

 chromatophore. On watching an antheridium in water, it 



Fig. 60. Fucus. An Oogonium, seated on its Stalk-cell, with Paraphyses, 

 as seen in Section of a Female Conceptacle. 



may be seen to dehisce ; the outer layer (extine) of the 

 wall bursts open at one end, the mucilaginous inner layer 

 (intine) swells up and disappears, and the antherozoids 

 are set free as motile bodies with two laterally inserted 

 cilia easily seen on treatment with iodine, which kills and 

 stains the antherozoids, 



