PIROPLASMA MURIS. 505 



"malignant jaundice" in dogs in vSonth Africa, India^ Sene- 

 gambia, Italy, and France (13, 34, 39, 40, 41, 51). 



(4) P. ovis (Starcovici, 1892) in sheep in Hungary, Rou- 

 mania, Italy, and Germany (" Carceag " [38]). 



(5) P. equi (Laveran, 1899), the pathogenic agent of biliary 

 fever in horses in South Africa and Italy. The same or a 

 closely allied species occurs in donkeys in South Africa 

 (Dale [8]). 



(6) A species, apparently unnamed, has been described 

 by P. H. Ross (44) in 1904 from monkeys (Cercopithecus) 

 in Africa. 



(7) P. hominis (specific name due to Manson in 1903, 

 though the parasite was first described by Wilson and 

 Chowning) in cases of " Tick " or " Spotted Fever " in man 

 in the Rocky Mountains. 



(8) P. donovani (Laveran and Mesnil [27, 28]), for the 

 Leishman-Donovan bodies (9, 10) found in cases of kala-azar 

 and Oriental sore in man in India, Arabia, China, Egypt, 

 and Tunisia. There is doubt as to the accuracy of placing 

 these bodies in the genus Piroplasma (see below). 



(9) Liihe (33 a, p. 201) mentions a little known, and appa- 

 rently unnamed, species of Piroplasma found by Ziemann 

 (53) in the Cameroons in the blood of sheep, goats, horses, 

 and donkeys (''Tier-Malaria"). 



P. muris, as I have found and measured it, seems dis- 

 tinctly smaller than P. can is, and apparently slightly smaller 

 than the type species, P. bigeminum, though the sizes of 

 the latter, as given by different observers from various 

 localities and cases, vary somewhat. Indeed, this variation 

 in size seems to apply to many of the species of Piroplasma, 

 according to case, locality, and observer, perhaps due to the 

 smallness of the parasite and consequent difficulty in precise 

 measurement, as well as to differences in fixation and staining. 



The genus Piroplasma stands distinctly apart from the 

 other Haemosporidia. It may be that the Hasmosporidia, as 

 at present understood, is really a heterogeneous group, which 

 will ultimately have to be broken up. Laveran (22), one of 



