15 



VI. — Flag ELL AT HS. I, Carteria. 2, Sphterella. 3, Volvox. 4, Chlamy- 

 domonas. 5, Dinobn-on. 6, Euglena. 7, Eudorina. 8, Eudorina (young 

 colony). 9, Uroglena. 10, Gonium. 11, Phacus. 12, Mallomonas. 13, 

 Pandorina. 14, Uvella. 15, Synura. 16, Pandorina. 17, Ceratium. 18, 

 Peridiniiun. 



VII. — [, Statobla.st of Plumatella. 2, Statoblasfjof Pectinatella. 3, Arcella, 

 lateral view. 4, Arcella, ventral view. 5, Amreba. 6, Difflugia. 



