29 1 



Larvae ; attack a sheep (first host). Moult on sheep 



in seven to eight days and become 

 Nymphs. After growing (twenty-one days) they fall 



off and moult on the ground and become 

 Adults. The Adults attack a sheep (second host) and 



give infection. 



8. P. muris. Found in the blood of three albino 

 rats (Mus rattus). About one per cent, of corpuscles 

 infected. Typical ' pears ' occur. The rats in all 

 cases died from (?) Piroplasma. 



9. P. rossi. In monkeys, East Africa. 



10. P. sp. In sheep. India. Resembles 

 P. parvum. 



11. P. cervi. In the fallow deer (Cervus dama) 

 in Lisbon. Bacillary and cross forms were present, 

 but no typical pears. 



12. P. aristotelis. In young hinds (Cervus 

 aristotelis) in Annam. Ovoid and cross forms occur. 

 Bacillary forms not found. It may be identical with 

 the previous species. 



13. P. quadrigeminum. In Ctenodactylus gondi, 

 the gundi, a rat-like rodent of N. Africa. The 

 following forms occur in naturally infected animals : 



(1) Young forms i/^ in diameter. These may 

 become elongated or comma-shaped. 



(2) Forms 2^ in diameter having a vesicular 

 nucleus with a large curved chromatin mass and a small 

 punctiform chromatin mass, as in Leishman-Donovan 

 bodies. 



(3) Typical pyriform parasites larger than the 

 last. In Ct. gondi artificially infected, parasites appear 

 about the third day and in about a week multiplication 

 forms. The parasite divides into four, the segments 

 remaining for some time attached in the form of a fan. 



14. P. ves-peruginis (vide p. 249). 



