388 



SPOBOZOA. 



Remarks. — Nieschulz (1921) at first failed to infect chicks 

 with the Coccidium of the pigeon, but later (1925) succeeded 

 in doing so. Wenyon (1926) doubts if E. pfeijferi (Labbe) 

 of the pigeon is distinct from E. avium (Rivolta & Silvestrini) 

 of the chick. Pinto (1928) has proposed a new name, E. lab- 

 beana, for Coccidium pfeijferi Labbe and Eimeria pfeifferi 

 Labbe. 



Genus PROTEOSOMA Labbe, 1894. 



(Pages 247-59.) 



318. Proteosoma passeritse (de Mello & da Fonseca). (Fig. 190.) 



^Plasmodium passeritae, de Mello & da Fonseca, 1938, pp. 47-8, pi. vi. 



Ring-forms with the cytoplasm very compact or more or 

 less vacuolated, with small dots of pigment scattered all over 

 the bod3^ Schizonts minute, pyriform or amoeboid, devoid 



Pig. 190. — Proteosoma passeritae (de Mello & da Fonseca). A, B, ring 

 forms ; G, D, schizonts ; E, cruciform rosette. (After 

 de Mello and da Fonseca.) 



of pigment, which may even be absent in larger roundish 

 forms. Chromatin divides into two, three or four granules, 

 thus determining the number of resulting merozoites, which 

 may be arranged in a cross-hke manner. Infected red corpuscles 

 do not show any alteration. 



Dimensions. — Ring-forms 1-3 /x, rosettes 3-4 /x. 



Remarks. — ^Apart from the fact that the rings are pigmented, 

 the resemblance to Babesia qvudrigemina (NicoUe) is very 

 striking, as is also the case with P. minasense (Carini & Rudolph) 

 from certain lizards. 



Habitat. — Blood of the green snake, Passerita mycterizans 

 Daud. : Portuguese India, Nova Goa. 



