FUCUS PLATYCARPUS. 



301 



FIG. 111. A to F. Fucus platycarpus. A, evacuated contents of an oogonium, 

 surrounded by the inner cell-wall ; , evacuated contents of an antheridium, sur- 

 rounded by the inner cell-wall ; C, an antheridium, fixed with alcohol and stained with 

 logwood ; D, cross-section through the similarly fixed and stained contents of an 

 oogonium ; E, evacuated oospheres, and a remnant of the envelope of the oogonium ; 

 F, oosphere, with adhering spermatozoids. 



G and H. Fucus vesiculosus. Cr, spermatozoids, fixed with iodine ; H, oosphere, 

 with adhering and swarming spermatozoids. (C and CV x 540 ; the other figures x 240). 



