106] 



The Classification of Lower Organisms 



Fig. 20. — a., Colacium Arbuscula after Stein (1878). b^ Euglena viridis. c, Eu- 

 glena Spirogyra. d, Euglena acus. e, Phacus sp. f, Trachelomonas sp. g, Kleb- 

 siella alligata after Pascher (1931). All x 1,000. 



