POLYMASTIGINA 



295 



Genus Mixotricha Sutherland. Large; elongate; anterior tip 

 spirally twisted and motile; posterior end probably eversible; body 

 surface with a coat of cilia in closely packed transverse bands (in- 

 sertion and movement entirely different from those of Trichonym- 

 pha) except posterior end; 3 short flagella at anterior end; nucleus, 



o- 



Fig. 134. Diagram illustrating the life-cycle of Tetramitus rostratus 

 (Bunting), a, cyst; b, vegetative amoeba; c, division; d, after division; 

 e, f, stages in transformation to flagellate form; g, fully formed flagel- 

 late; h, flagellate prior to division; i, flagellate after division; j-1, trans- 

 formation stages to amoeba. 



20/x by 2ju, connected with blepharoplasts by prolonged tube which 

 encloses nucleus itself; cytoplasm with scattered wood chips; in 

 termite gut. One species. Taxonomic position undetermined. 



M. paradoxa S. About 340/x long, 200)li broad and 25/x thick; in gut 



of Mastotermes darwiniensis; Australia. 



