GENUS: ENDOTRYPANUM 



485 



Reiclienow (1917, 1920c) observed trypanosomes of the T. lewisi type in 

 both chimpanzees and gorillas, as also in a lemur (Perodictus) and in 

 C. cephus in the Cameroons. He proposed to name the trypanosome 

 T. lewisi var. primatum, as on morphological grounds he regards it as a 

 variety of T. lewisi. Yamasaki (1924), as already noted, failed to infect 

 monkeys by means of fleas which had become infective after feeding on 

 rats harbouring T. lewisi. Direct inoculation of blood from infected rats 

 into monkeys has also failed to infect them with T. lewisi. Chagas 

 (1924), in Brazil, found monkeys {Chrysothrix sciureus) naturally infected 

 with trypanosomes. These were studied in inoculated guinea-pigs and 

 dogs, with the result that he arrived at the conclusion that the trypano- 

 some was T. cruzi, with which it agreed in its morphology and method of 

 multiplication. 



Genus: Endotrypanum Mesnil and Brimont, 1908. 



Mesnil and Brimont (1908a) described under the name Endotrypanum 

 schaudinni a curious parasite which occurred in the red cells of Choloepus 



y 



Fig. 204. — Endotrypanum schaudinni in the Blood of the Sloth, Cholceinis 

 didactylus. (1-3, after Mesnil and Brimont, 1908; 4-6, after Darling, 

 1914). 



1-3. Parasites in the red blood-corpuscles (x ca. 1,800). 



4-6. Two intracorpuscular forms and one free form ( x ca. 3,000). 



didactylus, the two-toed sloth of Guiana (Fig. 204). As it is undoubtedly 

 related to trypanosomes, it is considered here. It was elongated and 

 piriform in shape, one end being blunt or rounded and the other fine and 



