GROUP I. THALLOPHYTA : ALG^ : PHJCOPHYCEvE. 265 



G 



FIG. 191. A Eight oospores extruded from the oogonium, surrounded by the inner layer 

 of the cell-wall : B contents of an antheridium set free, surrounded by a layer of the cell- 

 wall : C antheridium : I) section of contents of an oogonium showing the divisions accom- 

 panying the development of the oospheres : -E oospheres set free in consequence of the 

 rupture of the layer of cell-wall by which they were surrounded when first extruded : F 

 and H oospheres, with spermatozoids : G spermatozoids. A-F Fucus platy carpus; GH, 

 F. vesiculosus. (C and G x 540; other figs, x 240: after Strasbnrger.) 





