POLYMASTIGINA 299 



cytostomal cleft near anterior end; nucleus, vesicular, often without 

 endosome; 3 anterior flagella about T-lO/x long; the fourth flagellum 

 short, undulates in the cleft which ridge is marked by 2 fibrils. The 

 cyst pyriform; 7-10/x long; a single nucleus; 2 cytostomal fibrils and 

 a short flagellum; commensal in the caecum and colon (some con- 

 sider also in small intestine) of man. Both trophozoites and cysts oc- 

 cur in diarrhoeic faeces. It is widely distributed and very common. 



C. intestinalis Kuczynski. In guinea pigs. 



C. hettencourti da Fonseca. In rats and mice. 



C cuniculi da Fonseca. In rabbits. 



C. caprae da Fonseca. In goat. 



C. gallinarum Martin and Robertson. 11-20/x by 5-6^; in domes- 

 tic fowls. 



Family 5 Callimastigidae da Fonseca 



Flagella 12 or more; in stomach of ruminants or in caecum and 

 colon of horse. 



Genus Callimastix Weissenberg. Ovoid; compact nucleus central 

 or anterior; 12-15 long flagella near anterior end, vibrate in unison. 

 Weissenberg (1912) considered this genus to be related to Lopho- 

 monas (p. 320), but organism lacks axial organellae; in Cyclops and 

 alimentary canal of ruminants and horse. 



C. cyclopis W. In body-cavity of Cyclops sp. 



C. frontalis Braune (Fig. 138, c). 12 flagella; about 12/i long; fla- 

 gella 30/x long; in cattle, sheep and goats. 



C. equi Hsiung (Fig. 138, d). 12-15 flagella; 12-18m by 7-10^; 

 nucleus central; in caecum and colon of horse. 



Family 6 Polymastigidae Blitschli 



Genus Polymastix Biitschli. Pyriform; 4 flagella arise from 2 

 blepharoplasts located at anterior end; cytostome and axostyle in- 

 conspicuous; ectoplasm covered by longitudinal ridges; endocom- 

 mensal in insects. 



P. melolonthae (Grassi) (Fig. 138, e). 5-22^ long; in hindgut of 

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



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. 138,/). About 10-25^ long; in intestine 

 of snakes: Pituophis, Eutaenia, and Python. 



