LIFE-HISTORY OF THE PAEASITES OF MALARIA. 577 



Genus II. Hfemom enas, gen. nov. (syn. Laverania, 

 Grassi and Feletti, in part). The gametocytes have a special 

 (crescentic) shape. 



DESCRIPTION OF PLATES 30 & 31, 



Illustrating Major Ronald Ross's and Dr. R. Fielding-Ould's 

 paper on " The Life-history of the Parasites of Malaria." 



Pigs. 1 — 41 illustrate the two avian species and the three human species in 

 the blood-vessels of the vertebrate hosts. 



Figs. 42 — 52 illustrate the development of the gametocytes of one of the 

 human species, selected for the purpose, in the stomach cavity of Anopheles, 

 or in a drop of blood freshly extracted from the finger (in which the parasites 

 develop much as they do in the stomach cavity of the insects). 



Pigs. 53 — G7 illustrate the further development of the parasites in the 

 tissues of the gnat. 



Figs. 1 — 7. — Development of Hsemamoeba Danilewskii (syn. Halte- 

 ridium Danilewskii, Labbe) in the blood of pigeons, jays, crows, etc. 

 The amoebula is elongated, and lies by the side of the nucleus without dis- 

 turbing its position. Several varieties exist. 

 Fig. 1. — Spore. 



Figs. 2 — 4. — Growth of amoebula. 

 Fig. 5.— Sporocyte. 

 Fig. 6. — The containing corpuscle has burst, leaving nucleus, melanin, 



and free spores. 

 Fig. 7. — Gametocyte. 

 Figs. 8 — 14. — Development of Ha3m amoeba relicta (syn. Proteosoma 

 Grassii, Labbe) in the blood of sparrows, larks, crows, etc. The amoebula 

 lies at one end of the corpuscle, and pushes the nucleus towards the other 

 end. 



Fig. 8. — Spore. 



Figs. 9 — 11. — Growth of amoebula. 

 Fig. 12. — Sporocyte. 

 Fig. 13. — Freed spores. 

 Pig. 14. — Gametocyte. 

 Pigs. 15 — 22. — Development of llfemamceba malarije, the parasite of 

 quartan fever of man. The containing corpuscle is a small or medium-sized 



