268 



THE SPOROZOA 



as in the preceding. Gametocytes bean-shaped. 1 One| species, H. dani- 

 lewskyi, Kruse (syn. Proteosoma grassii, Labbe), parasitic on a large number 



/ N 



FIG. 78. 



Haemoproteus danilewskyi, Kruse (par. birds), a, young trophozoite in a blood-corpuscle. 

 b and c, older trophozoite. d and e, sporulation. d, precocious sporulation, with few mero- 

 zoites. e, sporulation of a full-grown schizont, with numerous merozoites. /, gametocyte. 

 N, nucleus of blood-corpuscle ; n, nucleus of parasite ; p, pigment ; mz, merozoites ; r.p, residual 

 protoplasm. (After Labbe.) x about 1200. [a, 6, c, and /from the chaffinch ; d and e from 

 the lark.] 



PIG. 79. 



HaUeridium danilewskyi (Gr. et. Fel.) (par. birds), various stages, a, young tropho- 

 zoite in a blood-corpuscle. 6, older trophozoite. c, macrogametocyte with spherical nucleus 

 and evenly-scattered pigment-granules, d, microgametocyte, with elongated irregular nucleus 

 and pigment-granules at the two extremities of the body, e, double infection, micro- and 

 macro-gametocyte in the same corpuscle. /, macrogametocyte throwing out pseudopodia. 

 g-l, schizogony. g, early stage of schizogony ; the nucleus of the schizont has divided into 

 two nuclei which travel to the two extremities of the body, h, the same stage more advanced. 

 i, each of the two nuclei of the preceding stage has divided into four, j, the nuclei at the two 

 poles have become very numerous, k, separation of merozoites (mz) and residual protoplasm 

 (r.p) containing the pigment -granules ; at one pole the arrangement of the merozoites is 

 roughly fan-like, at the other, mulberry-like. I, commencing liberation of the merozoites. 

 In the final stages of schizogony (i-l) the blood - corpuscle is acted upon and more or less 

 broken up by the parasite. N, nucleus of blood-corpuscle ; n, nucleus of parasite ; p.g, pig- 

 ment granules, (a-/ after Laveran ; g-l after Labbe.) x about 1200. [a-f from the pigeon ; 

 g-j and I from the lark ; k from the chaffinch.] 



of common birds (Fig. 78). The intermediate host is a gnat of the genus 

 Culex. Genus 7. HaUeridium, Labbe, 1894. Trophozoites as in the 



1 According to Neveu-Lemaire, the name Haemamoeba, Gr. et Fel., 1890, lias 

 the priority over Haemoproteus for this genus ; but the case does not seem very 

 clear, and since the name Haemamoeba has many applications, and is often employed 

 in a general as well as in a taxonomic sense, confusion is avoided by keeping to 

 Kruse's name. 



