C. C. Dobell 
295 
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DESCRIPTION OF PLATE XX. 
[All figures from permanent preparations stained by Giemsa’s method. Drawings 
made under 3 mm. oil-imm. apochromatic obj. x comp. oc. 12 (Zeiss).] 
Figs. 1-13. Haemogregarina sp. from Boa constrictor. 
Figs. 1, 2. Young forms. 
Figs. 3, 4. Larger forms, with slender recurved “ tail.” 
Figs. 5, 6. Stumpy forms. 
Figs. 7, 8, 9. Large forms. 
Fig. 10. Large form with chromatin fragments in cytoplasm—probably degenerate. 
Fig. 11. An organism lying inside its sheath (stained pink). 
Fig. 12. Empty sheath in a corpuscle. 
Fig. 13. Free form from blood plasma. 
Figs. 14, 15. Haemogregarina sp. from Python spilotes. 
Fig. 16. Haemogregarina sp. from Coluber quatuorlineatus. 
Parasitology i 
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