FIG. 7. Edogoninm nodosiim. a Conferva form : A, portion of a filament showing a 

 vegetative cell with its nucleus (d), an oogoninm (a) filled by an egg packed with 

 food material, a second oogonium (c) containing a fertilized egg or oospore as 

 shown by the heavy wall, and two antheridia (A), each containing two sperms; /?, 

 another filament showing antheridia (a) from which two sperms (6) have escaped, 

 a vegetative ceil with its nucleus, and an oogonium which a sperm (c} has entered 

 and is coming in contact with the egg whose nucleus (d) may be seen; C, a zoo- 

 spore which has been formed in a vegetative cell, showing the crown of cilia and 

 the clear apex, as in the sperms; D. a zoospore producing a new filament, putting 

 out a holdfast at base and elongating: K a further stage of development; F, the 

 four zoospores formed by the oospore when it germinates. CALDWELL. except 

 (7 and F, which are after PRINGSHEIM, 



