354 



BOTANY 



PART II 



membrane is closely applied to the protoplast, at the anterior end of which two cilia 



Fio. 283. ^4, B, Haeinatococcus plurialis (x 360) ; A, swarming cell ; ]',, formation of swarm- 

 spores. C-G, Baematococcus Biitschlii ; C, formation of gametes ( x 400) ; D, gamete : /.. 

 conjugation of two gametes ; t', <!, xygotes(x 800). (<'>!. alt* i Hi u. MMAVN.) 



Fio. 284. Volvox globator. A, Colony showing various stages of development of ova. and 

 spermatozoids (x 165). B, Bundle of spennatozoicls formed l>y division from a single 

 eell(x 530). C, Spermatoxoids ( x 530). D, Kgg-cell surrounded by spermatozoids in 

 the mucilaginous membrane (x 26o). (After F. COHN.) 



and a red eye-spot are situated ; in the latter genus the membrane is separated from 



