444 



PROTOZOOLOGY 



in diameter; paired pyriform bodies make a larger angle, 1.5-2/^ 

 long; transmitted by Ixodes ricinus. 



Babesia occur also in sheep, goats, pigs and horses. 



B. canis (Piana et Galli-Valerio). Pyriform bodies 4.5-5yu long; 

 the organism causes malignant jaundice in dogs; widely distrib- 

 uted; transmitted by ticks, Haemaphysalis leachi, Rhipicephalus 

 sanguineus, and Dermacentor reticulatus. 



Fig. 203. a-d, Babesia bigemina, X3000 (Nuttall); e-h, B. bovis, 

 X3000 (Nuttall); i-1, Theileria parva, X3000 (Nuttall); m-s, Daclylo- 

 soma ranarum (m-q), schizogony; r, s, gametocytes), X2700 (Noller). 



Genus Theileria Bettencourt, Franca et Borges. Schizogony 

 takes place in endothelial cells of capillaries of viscera of mam- 

 mals; certain forms thus produced enter erythrocytes and appear 

 in peripheral circulation. 



T. parva (Theiler) (Fig. 203, i-l). In cattle in Africa, cause of 

 African coast fever; intracorpuscular forms l-2^t in diameter; 

 transmitted by the tick, Rhipicephalus evertsi. 



Genus Dactylosoma Labbe. In blood of reptiles and amphib- 



