. 2flG. Edogoniuni nodosum, a Conferva form ; .4, portion of a filament, showing a 

 ve.E^etative celi with its nnclens id), an oogoninni ia) filled by an e^g packed with, 

 food material, a second oogoninm (r) containing a fertilized etrg or oospore as 

 shown by the heavy waW. and two antheridia ib). each containing two spei-ms; B, 

 another filament sho\\ing antheridia («i from which two sperms [b) have escaped, 

 a vegetative ceil wilh its nnclens, and an oogonium which a sperm (c) has entered 

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

 spore which has been formed in a vegetative cell, showing the c-rown of cilia and 

 the clear apex, as in the s^perms; ]). a zoospore producing a new filament, putting 

 ont a holdfast at base and elongating; E. a fnrther stage of development; F. t\\Q 

 fonr zoospores formed by the oos])ore when it germinates. —Caldwell, except 

 Cand F^ which, are after Pbingsheim. 



