506 



FAMILY: TRYPANOSOMID^ 



from the ked's gut. In older cultures of both kinds there appear numbers 

 of small trypanosomes, which are like the small metacyclic forms developed 

 in the hind-gut of the ked. In fact, the behaviour of the trypanosome in 

 cultures appears to be directly comparable with its development in the ked. 



%,^jr 



Fig. 215. — Trypanosoma meloph%gium of the Sheep and Sheep Ked, Melophngm 

 ovinus (x 2,000). (After Hoare, 1923.) 



1 . Trypanosome from blood of sheep . 



2. Three crithidia forms from mid-gut of ked. 



3. Small crithidia and leishmania forms from mid-gut of ked. 



4. Epithelium of hind-gut of ked with various attached flagellates. 



5. Metacyclic trypanosomes attached to epithelium of hind-gut. 



Attempts to inoculate mice, rats, and guinea-pigs with the flagellates 

 from the ked and with cultures have been invariably unsuccessful except 

 in the case of Laveran and Franchini (1914, 1919), who claim to have 

 infected mice by feeding them or inoculating them intraperitoneally 

 with the flagellates from the ked. The infection, however, was said to be 



