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protoplasm is vacuolated, and a nucleus (chro- 

 matin) 13 readily shown by staining (Romanowsky). 



The proteosoma vermiculi are larger and more 

 slender than those of halteridium. 



Development of Zygotes (one to two days).^ 

 The vermiculi have disappeared, but in the stomach 

 wall are now found transparent, spherical, pig- 

 mented bodies. 



Three to four days. — The zygotes have in- 

 creased in size, and sporoblasts appear in their 

 interior. In the larger forms, signs of further 

 division are seen (striation), formation of sporo- 

 zoits. 



Development of Sporozoits (nine to ten days). — 

 By this time the sporozoits have reached the 

 salivary glands. Somewhat earlier they can still 

 be found amidst the thoracic muscle. Earlier 

 still, they can be pressed out of the ripe oocysts 

 in the stomach wall. The sporozoits occupy 

 chiefly the middle lobe of the gland (Koch). 



Black Spores are found in the larger zygotes. 

 They also occur free . in the thoracic region (or, 

 possibly, in the gland substance). They are 

 brownish-black, curved, sausage-shaped bodies, 

 suggesting a mycelial nature. It is believed by 

 Grassi that they are degenerated sporozoits, as 

 they are found within the large sporoblast cysts. 

 We have, however, found them in or about the 

 salivary glands in Mysomyia rossii. 



2. H. danilewskyi (Halteridium). — Occurs 

 almost exclusively^ in the blood of ' passerine ' 

 birds. Pigeons are very commonly infected, also 

 sparrows,. finches, 'paddy' birds, parrots, etc. 



The parasite is characterized by its peculiar 

 curved halter shape, embracing the oval nucleus 



