POLYMASTIGINA 



307 



Kirby's recent work, the so-called undulating membrane is a large 

 cresta; in aflagellate phase (Myxomonas) the nuclear division takes 

 place. 



Fig. 143. a, Caduceia bugnioni, X930; b, Pseudodevescovina uniflagel- 

 lata, X1190; c, Bullanympha silvestrii, X780 (all after Kirby); d, e, 

 Gigantomonas hercidea (Dogiel) (d, X530; e, amoeboid phase (Myxo- 

 monas), X400). 



G. herculea D. {M. polymorpha D.) (Fig. 143, d, e). 60-75/i by 

 30-35/x; in the intestine of Hodotermes mossambicus. 



