MASTIGOPHORA AND PROTOMONADINA 



1 Family 2. Oicomonadidse. 



Family 7. Bodonidse. 

 Family 8. Cercomonadidse. 

 Family 9. Tetramitidae. 



Family OicoMONADiDiE Senn, 190c. 



Synonym. — Cercomonadina Saville Kent, 1880, fro parte. 

 Definition. — Monozoa with a single flagellum, no collar and no 

 kinetonucleus. 



Remarks. — 'This family was formed by Senn for Oicomonas, several 

 allied forms of which are to-day classified in the Trypanosomidae. 



Type Qemis,— -Oicomonas Saville Kent, 1880. 



Classification. — The various genera of this family may be differ- 

 entiated as follows: — 



A. Without definite nucleus. Chromatin diffuse — Selenomonas 



(Selenomastix) . 



B. With definite nucleus: — 



I 'J Rhizosiyle: not known to he present :■ — 

 {a) Fiagellum anteriorly directed:' — 



Body oval or roundish — Oicomonas. 

 (&) Flagellum trailing or posterior: — 



1, Body long spindle-shaped — Ancyromonas. 



2. Body three-cornered bowed leaf-shaped^ — 



Phyllomonas. 

 II. Rhizostyle present : — 



Body 6-11 X 3-5 microns. Flagellum springs 

 from a small basal granule, and is continued 

 backwards into the body by a dark staining 

 filament, the rhizostyle — Rhizomastix. 

 Only the first genus concerns us. 



Genus Oicomonas Saville Kent, 1880. 



Synonym. — Cercomonas Davaine, i860, pro parte nec Dujardin, 

 1841. 



Definition. — Oicomonadidae, with oval or roundish body and one 

 anteriorly directed flagellum. 



Remarks. — In 1841 Dujardin formulated the genus Cercomonas, 

 which Wenyon has placed upon a firm basis. 



In i860 Davaine described two varieties of flagellates which he 

 found in cholera motions. The first and larger of these, which he 

 calls A, is without doubt Chilomastix mesnili, while the second and 

 smaller is an Oicomonas. Unfortunately Davaine called both these 

 parasites Cercomonas hominis, but the genus was one of his own 

 construction, and most assuredly was not the Cercomonas of 

 Dujardin. 



In 1880 Saville Kent formed the genus for uniflagellate free- 

 swimming forms, which are capable of temporarily fixing themselves 

 to any object by extending a sarcode thread, which can be withdrawn 

 when they start to swim. 



