INTRODUCTION TO THE PROTOZOA 27 



Bodo 



Cercomonas 

 PleuroDionas 

 Proteroinonas 



Family AMPfflMONADIDAE 



Body naked or loricate, with 2 equal flagella. 



Spiromonas 



Order POLYMASTIGORIDA 



With 3 to about 12 flagella (2 in Retortamonas) and 1, 2 or several 

 nuclei. Without costa, axostyle (except in some Hexamitidae and Poly- 

 mastigidae) or parabasal body. 



Family TETRAMITIDAE 



With 4 flagella, 1 or 2 of which may be trailing. 



Enteromonas 

 Tetrmnitus 



Family RETORTAMONADIDAE 



With 2 or 4 flagella, of which 1 is trailing. With 1 nucleus. 

 Cytostome with supporting fibrils present. 



Chilomastix 

 Retortamonas 



Family CALLIMASTIGIDAE 



With a compact antero-lateral group of flagella which beat 

 as a unit. With 1 nucleus. 



Callimastix 

 Selenonwnas 



Family POLYMASTIGIDAE 



With 4 anterior flagella and axostyle. With 1 nucleus. 

 Apparently without parabasal body. 



Monocercomonoides 



