THE PEOTOZOA (continued) 



SECTION F. THE MASTIGOI>HORA l 



CLASS MASTIGOPHORA. 



SUB-CLASS I. LISSOFLAGKLLATA. 

 Order 1. Monadidea. 



Tribe 1. Pantostomatina. 

 Sub-Tribe 1. Holomastigoda. 

 2. Rhizomastigoda. 

 Tribe 2. Protomastigina. 



Sub-Tribe 1. Monomastigoda. 

 2. Paramastigoda. 

 3. Heteromastigoda. 

 ,, 4. Isomastigoda. 

 Tribe 3. Polymastigina. 

 Sub-Tribe 1. Trimastigina. 

 2. Monostomatina. 

 ,, 3. Distomatina. 

 4. Lophomonadina. 

 Order 2. Euglenoidea. 

 Tribe 1. Euglenina. 

 2. Astasiina. 

 3. Peranemina. 

 Order 3. Chromomonadidea. 

 Tribe 1. Chloromonadina. 

 2. Chrysomonadina. 

 3. Cryptomonadina. 

 SUB-CLASS II. CHOANOFLAGELLATA. 

 Order 1. Craspedomonadina. 



2. Phalansteriina. 

 SUB-CLASS III. PHYTOFLAGELLATA. 

 Order 1. Chlamydomonadina. 



2. Volvocina. 



SUB-CLASS IV. DINOFLAGELLATA. 



Tribe 1. Gymnodiniaceae. 



2. Prorocentraceae. 



3. Peridiniaceae. 



SUB-CLASS V. CYSTOFLAGELLATA. 



SUB-CLASS VI. SILICOFLAGELLATA. 



1 By Arthur Willey, F.R.S., and Prof. S. J. Hickson, F.R.S. 

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