256 
somewhat alveolar cytoplasm, with a central nucleus containing i 
karyosome. The exact delimitation of the nucleus of a 
Leucocytozodn within its host cell is often difficult. 
In the specimens of L. lovati that I examined, the micro- 
gametocytes were found to measure from 13// to 17 n by 6/i to 1 2/1 
while the macrogametocytes were 14/1 to 20n by 10/1 to 16/1. 
Till recently, the gametocytes and gametes only of avian Lata- 
cylozoa were known. However, parasites somewhat intermediate in 
type between the male and female gametocytes occur, though such 
intermediate forms are not at all common in the peripheral blood of 
the host. The intermediate forms in the case of L. lovati may be 
seen in the blood of the spleen of the grouse, though they maybe 
easily overlooked. 
In the summer of 1909, I examined two fresh grouse in whose 
peripheral and heart blood living Leucocytozoa were seen. The 
internal organs were immediately examined after the death of the 
birds. In stained preparations of the spleens of the two birds, small 
vermicular forms were encountered, both free and just entered into 
theii host cells. Careful search showed that in the spleen were many 
ull-grown Leucocytozoa, some of which exhibited no very definite 
sexual differentiation. While the gametocytes encountered in the 
ood often produced marked elongation of the host cells, the deforma- 
on in the case of the special splenic forms was slight (fig. 3), and 
e lost cells seemed almost entirely absorbed (fig. 4). These para- 
es are the schizonts, which are slightly smaller than the gametocytes, 
and measure ir* to i 4 „ by 8, to n„. The cytoplasm of the oval 
ecomes somew hat concentrated while they are uninucleate 
* ^' . 10 C ^ aracter of t ^ ie nucleus of the schizont approaches that 
o the microgametocyte, while the general cytoplasm resembles that 
he macrogametocyte, but differs from it in being less alveolar and 
possessing smaller granules. 
bin^t- muItjpllCation occurs * apparently, by a series of rapid 
united J? S1 ° n ®’ an< * t,ie daughter nuclei, some of which may remain 
pherv c*, ° r a S ^ lort tame, ultimately migrate towards the pen- 
(fis- 61 a §™ e ntati°n of the cytoplasm around the small nuclei occurs 
«e Produced eT^ “ S ° me tWeK ' e to 
organism 1.1 C merozoite is a small, vermicular, somewhat curved 
ganism, capable of active movement. The meroiortes measure » 
