96 J. B. CLELAND AND T. H. JOHNSTON. 



Diagram II Figs 1 — 15, Halteridium meliornis. 



Figs. 1-6, showing single infection with parasite in various 

 positions and stages of development. 



Figs. 2, 6, pigmental forms. 



Figs. 7, 8, 9, showing double infection. 



Figs. 10, 11, 12, showing triple infection. 



Fig. 13, host cell with 4 halteridia. 



Fig. 14, host cell with 5 halteridia. 



Fig. 15, host cell with 7 halteridia. 



Figs. 16 — 26, Halteridium geocichlae. 



Fig. 17, host cell showing a thinning of its protoplasm in two 

 places, suggesting either an earlier infection, or else the with- 

 drawal of the parasite from the extremities to form the 

 rounded body seen in the figure. 



Fig. 18, a nucleated form. 



Fig. 19, double infection. 



Figs. 20, 25, halteridia dividing 1 Both parasites are vacuolated. 



Fig. 21, nucleated male gametocytes, with ruptured nucleus of 

 host cell adjacent to one. 



Fig. 22, gametocyte with flagella? 



Fig. 23, female gametocyte (host nucleus lying adjacent). 



Plates I and IT, Microphotographs of blood film from Meliornis 

 novcB-hollandice, showing spermatozoa. 



