STUDIES ON CEYLON H.KMATOZOA. 7(31 



EXPLANATION OF PLATES 32—41, 



Illustrating Miss Muriel Robertson's paper on " Studies on 



Ceylon Hti3uuxto/.oa." 



[The figui-es are all drawn with the Abbe camera at a uniform magni- 

 fication of 2J:00 diameters.] 



Figs. 1-24: represent stages from the vertebrate host Nicoria trijuga. 

 Figs. 1-15 (with the exception of fig. 9) are stages from the blood 

 treated by the wet method throughout and stained with Heiden- 

 hain's iron-lia3matoxylin. Figs. 16-2-1 are from sections of the lung 

 stained with Mayer's haimalum. 



Fig. 1. — Bean-shaped hsemogregarine with circular type of nucleus. 

 Fig. 2. — Half -recurved specimen with circular niicleus ; the chromatin 

 is symmetrically arranged and the central giunule is visible. 

 Fig. 3. — Bean-shaped specimen, the stain further extracted. 

 Fig. 4.— Small form derived from schizogony in the blood. 



Fig. 5. — Bean-shaped specimen showing the chromatin in the nucleus 

 arranged in two rings, one within the other. This creature has been 

 set free mechanically in the making of the film. 



Fig. 6. — Bean-shaped specimen with reticulate nucleus. 



Fig. 7. — Small compact specimen. 



Figs. 8 and 9. — Fully recurved (vermiform) specimens. Fig. 9 is 

 from a dried film stained with Giemsa. 



Fig. 8a. —Recurved specimen where the recurved limb is being 

 reabsorbed. 



Fig. 9 a. — Half -recurved individual, rather bi-oad, and with a large 

 nucleus containing irregulaily arranged chromatin. 



Figs. 10-13. — Early stages of schizogony in the blood-stream. 



Figs. 11 and 15. — Final stages of schizogony in the blood-stream. 

 Fig. 15 has been decolourised to a greater extent than fig. 11 ; both show 

 six merozoites. 



Fig. 16. — Early stage of above type of schizogony from section of 

 the lung ; one of the nuclei is undergoing division. 



Figs. 17 and 18. — Bean-shai^ed specimens from section of lung. 

 Fig. 19. — Earliest stage of scliizogony in the lung. 

 Fig. 20. — Slightly later stage of schizogony ; the schizont has 

 increased in size and the nucleus has divided. 



