252 



PROTOZOOLOGY 



^ Q Q 



a 



Fig. 117. a-f, Leishmania donovani (a, three individuals from lymph 

 smear of a kala azar patient; b, from a spleen smear; c-f, cultural 

 forms), X2000 (Wenyon; Thomson and Robertson); g, h, L. tropica 

 (g, from an Oriental sore; h, the organisms in a polymorphonuclear 

 cell from a sore), X2000 (Wenyon; Thomson and Robertson); 

 i, Cryptobia helicis, X2530 (Belaf); j, C. borreli, X870 (Mavor); k, C. 

 cyprini, X890 (Plehn). 



L. hrasiliensis Vianna. The organism occurs in South and Cen- 

 tral America; some authors consider this species as identical with 

 L. tropica. 



Although morphologically identical, these species show specific 

 serum reactions. 



Family 6 Cryptobiidae Poche 



Biflagellate trypanosome-like protomonads; 1 flagellum free, 

 the other marks outer margin of undulating membrane; bleph- 

 aroplast an elongated rod-like structure, often referred to as the 

 parabasal body; all parasitic. 



Genus Cryptobia Leidy (Trypanoplasma Laveran et Mesnil). 

 Parasitic in reproductive organs of molluscs and other inverte- 

 brates and in blood and gut of fish. 



