SPOROZOA 



415 



a curved spindle and actively creeps over the 

 slide. It is then known as the ookinete. Fur- 

 ther development has not been observed, but there 

 can be little doubt that the further stages of 

 sporogony and also the unobserved stages of 

 schizogony in the bird are somewhat analogous 

 to those of H. columbcE or to those of the plas- 

 modia of human malaria. Whether the halteridia 

 which occur in various species of birds are all of 

 one species cannot be decided without further in- 

 vestigations. 



Haemoproteus (Leukocytozoon) Ziemanni. 

 This organism was doubtless seen by Danilewsky 

 in iSgo. 1 Ziemann in 1898 described it as a para- 

 site in the blood of hawks. Its known life history 

 is very incomplete, and even the nature of the 

 blood cell containing it is somewhat doubtful. 

 The youngest stage observed in the blood is a 



FIG. 184. 

 H &mo prote u s 

 (Leukocytozoon) 

 ziemaunni. Macro- 

 gametocy te and 

 microgametocy t e 

 (paler.) (From 

 Doflein after 

 Schaudinn.) 



A B 



FIG. 185. Hamoproteus (Leukocytozoon^ ziemanni. A, Formation of micro- 

 gametes from the microgametocy te; B, Fertilization of the macrogamete by one of 

 the microgametes swarming about it. (From Doflein after Schaudinn.) 



1 Cenlrabl.f. Bakt., 1891, Bd. IX, S. 401, Fig. i. 



