714 MISS ANNIE PORTER ON A [June 16, 



(c/. Karyolysus among the Hsemogregarines). A thin cytocyst is 

 formed probably by the host-cell around the parasite (PI. XXXIX. 

 figs. 16, 17). 



(4) Endoglobular forms are on the average 8/i long by S^u broad 

 (c/. PI. XXXIX. figs. 15, 16, 17). 



(5) Schizogony takes place in the bone-marrow. An endo- 

 globular trophozoite rounds itself off and becomes a schizont, 

 breaking up into merozoites, each about 4'4/Lt long and -S^u broad 

 (PI. XXXIX. fig. 20). This again suggests aifinities with Karyo- 

 lysus, judging by Labbe's figures of schizogony in Karyolysus. 



(6) Two parasites may sometimes occur within one host-cell. 

 Two such forms suggesting the beginning of association are shown 

 in PI. XXXIX. figs. 21, 22. 



Differentiation into male and female forms could not be made 

 out with certainty, though some paiasites were shorter, broader, 

 and more granular than others. 



(7) Yermicules were found in the gut and Malpighian tubules 

 of lice, ectoparasitic upon the mice, but unfortunately no evidence 

 of a sexual cycle in the louse was obtainable. Perhaps the lice 

 merely act as mechanical agents in the transfer of the parasites 

 among the mice. 



(8) The parasites are found in smears from the heart and liver 

 in abundance. They are less numerous in spleen and kidney 

 smeai'S, also in the bone-marrow and peripheral circulation. They 

 were not abundant in the latter. 



(9) ISTo Trypanosomes were seen in the infected mice. 



(10) The movements of the vermicules or trophozoites of this 

 parasite in the blood-plasma of its Vertebrate host are fully 

 described in section YI. of this memoir. 



XI. References to Literature. 



[1] Adie, J. R. 1906. — " Xote on a Leucocytozoon found in 

 Mus rattus in the Punjaub." Journ. Trop. Med., vol. ix. 

 pp. 325-326. 



[2] Balfour, A. 1905-6 — "A Hsemogregarine of Mammals 

 {ff.jacuU)." Journ. Trop. Med., vol. viii. pp, 241-244, and 

 vol. ix. p. 82. 

 [2a] Balfour, A. 1906. — Second Report of the Wellcome 

 Research Labs, at Gordon College, Khartoum. Leuco- 

 cytozoon muris, pp. 110-111. 



[3] Bentley, C. 1905. — " Preliminary Note on a Leucocytozoon 

 of the Dog." Brit. Med. Journ., 1905 (i), p. 988. 



[4] Carini, A. 1907. — " Un leucocitozoo del Le2)todactyhts 

 ocellatus" Rev. da Soc. Scient. de Sao Paolo, no. 8. 



[5] Christophers, S. R. 1906. — '■'■Leucocytozoon canis." Sci. 

 Mem. Govt. India, No. 26. 



£6] Christophers, S. R. 1907. — " The Sexual Cycle of Leuco- 

 cytozoon canis in the Tick." Sci. Mem. Govt. India, 

 No. 28. 



