266 



THE SPOROZOA 



the same host, is apparently a distinct species. L. avium (Labbe"), from 

 birds, is believed by Grassi to be the ookinete stage of Halteridium 

 danilewskyi. Genus 2. Karyolysus, Labbe", 1894. The haemogregarine 



a 



FIG. 76. 



Karyolysus lacertarum(Da,ml.), in the blood-corpuscles of Lctcerta muralis, showing the effects 

 of the parasite upon the nucleus of the corpuscle. In c and d the nucleus is broken up. N, 

 nucleus of the corpuscle ; n, nucleus of the parasite, seen as a number of masses of chromatin, 

 not enclosed by a distinct membrane. (After Marceau.) 



does not exceed the blood-corpuscle in length. One species, K. lacertarum 

 (Daiiil.) (Figs. 73, 76), from lizards (Lacerta spp.). To this genus, probably, 

 should be ascribed the parasite of Testvdo ibera described by Popovici [91], 



f. 



FIG. 



Haetnogregarina stepanovi, Danilewsky (par. Emys and Cistudo), phases of the schizogony. 

 a, blood-corpuscle with young trophozoite. ft, older trophozoite. c, full-grown trophozoite, 

 ready to leave the corpuscle, d and e, trophozoites free in the blood-plasma, showing changes 

 of form, f-i, trophozoites still within the blood-corpuscle to show the structure of the nucleus, 

 the coarse chromatoid granules in the protoplasm, and the manner in which the parasite grows 

 into the U-shaped haemogregarine without increase of body -mass, j, commencement of sporu- 

 lation ; the nucleus has divided into eight nuclei, and the body of the parasite is beginning 

 to divide up into as many merozoites within a blood -corpuscle. N, nucleus of the blood- 

 corpuscle ; n, nucleus of the parasite, (a-e and j after Laveran ; f-i after Borner.) x 1000- 

 1200 diameters. 



and perhaps also the " Drepanidium serpentium" described by Lutz [82] 

 from a number of species of snakes. Genus 3. Haemogregarina, Danilewsky, 

 1885 (syn. Danilewskya, Labbe, 1894). The body of the parasite exceeds 



