GREEN ALGAE 



363 



/5\* 



Fig. 267. 



A , B, Sphaerella (Haematoccus) pluvialis ( x 360); A , swarming cell ; B, formation 

 of swarm-spores C-G, Haematococcus Butschlii ; C, formation of gametes ( x «.oo) ■ D, 

 gamete ; E, conjugation of two gametes ; F, G, zygotes ( x 800). (C-G, after Bloch- 

 mann, from Strasburger.) 



t!i"2->*^»»*«^sS ; 



Fig. 268. 



Volvox globator. A, colony showing various stages of development of ova and 

 spermatozoids ( x 165) ; B, bundle of spermatozoids formed by division of a single cell 

 ( x 530). C, spermatozoids ( x 530). D, egg-cell surrounded bv spermatozoids in the 

 mucilaginous membrane ( x 265). (After Cohn, from Strasburger.) 



