376 



PROTOZOOLOGY 



C. equi Hsiung (Fig. 157, o). 12-15 flagella; 12-18/* by 7-10/*; 

 nucleus central; in caecum and colon of horse. 



Family 6 Polymastigidae Biitschli 



Genus Polymastix Biitschli. Pyriform; four flagella arise from two 

 blepharoplasts located at anterior end; cytostome and axostyle in- 

 conspicuous; body often covered by a protophytan; commensals in 

 insects. Species (Grasse, 1926, 1952). 



P. melolonthae (Grassi) (Fig. 158, a). 10—15/* by 4-8/*; body cov- 

 ered by Fusiformis melolonthae (Grasse, 1926) : in the intestine of 

 Melolontha, Oryctes, Cetonia, Rhizotrogus, Tipula, etc. 



Fig. 158. a, Polymastix melolonthae, X2000 (Grasse); b, Eutrichomastix 

 serpentis, X1450 (Kofoid and Swezy); c, E. batrachorum, X1350 (Dobell); 

 d, E. axostylis, X2000 (Kirby); e, Chilomitus caviae (Nie); f, Hexamastix 

 termopsidis, X2670 (Kirby); g, H. batrachorum; h, Protrichomonas legeri, 

 X1000 (Alexeieff); i, Monocercomonoides melolonthae, X2000 (Grasse); j, 

 Cochlosoma rostraturn, X1465 (Kiiriura). 



Genus Eutrichomastix Kofoid and Swezy (Trichomastix Bloch- 

 mann). Pyriform; anterior end rounded; cytostome and nucleus 

 anterior; 3 flagella of equal length arise from anterior end, the fourth 

 trailing; axostyle projects beyond posterior end of body; all endo- 

 commensals. 



E. serpentis (Dobell) (Fig. 158, b). About 10-25/* long; in intestine 



