NOTES AND MEMORANDA. 



183 



Fig. a. a, A spermatozoid making its exit j I, two having done so, still 

 enclosed in a gelatinous investment ; c, a spermatozoid set free ; s, one still 

 remaining in the mother-cell. 



Fig. B. o, Oogonium with its coats and showing (ff) the gonosphere ; s, a 

 spermatozoid external to the oogonium, and s' one Caught in the oogonium- 

 opening. 



Fig. C. Oogonium with gonosphere and three spermatozoids. 



Fig. D. a, A series of emptied antheridia, their openings directed to either 

 side ; sp. oospore. 



Fig. E. a. Series of emptied antheridia ; sp. the oospores ; b, further de- 

 velopment of the fertilised (?)gonospheres. 



