fiOO J)l(. II. li. FAXTIIAM l)X THE [^InV 3, 



EXPLANATION OF I'LATES LV.-I.VIII. 



All fipiircs (i\itliiuMl witli Al)l)e-Zeiss eanipra liiciiln. from stained ])ici)iHiili(>:is 

 (src-tioiis of intected jiutl oxcoj)t where otlioiwise stated. Zeiss 2 mm. a])i;cliv()niatic 

 immersion objective and comj)ensatinfj ocular 8 usually employed. Tlie ma?- 

 iiiiication is about 1 lUd diameters, e.\cc|)t where indicated otherwise. Many 

 parasites are rei)re.sented lying in ])orti<ms ot the degenerating'' eiiithoHum 

 surrounding them. 



Pl.ATK LV. 



Fig. 1. Portion of gut (ca'cum) of infected grouse to show mucous nieinhrane 

 riddled with iiarasites. Many stages in life-history of Kimcria avium 

 shown therein. 



2. Sporozoite from duodenum, showing its trail stained. 



3. Sporozoite penetrating epithelium. 



4. Young parasite just entered epitlielium, by tine channel which is still open. 



Tlie entering ])aiasite is l)y the side of a slightly older (rounded) 

 l)arMsite or young troidioznite. 



6. fi. Parasites beginning to become round. 



7. Sporozoite, curved on itself, preparatory to becoming round. Duodenum. 



8. Koiind, young parasite, with relatively vesicular nucleus containing 



karyosoine. 

 {). Young tro])hozoite, as yet oval in slia])e, lying in relatively large space in 



the gut-wall. 

 10, 11. Kouiid trophozoites, with large nuclei each containing a karyosouie. 



Large sjiace surrounding iiMra>itc sliown in tig-. 11. 



12. (((\ Uiiimicleate, tiill-grown tro])!!! zoite, becDiuiiig a schizont. 

 (I>) Schizont in which nucleus is (li\idini;'. Duodenum. 



13. Schizont in process of nuclear fraainentatioii. 



14. 1.5, 16, 17. Schi'zonts containing many nuclei which go to the ])ei'ipbory ot 



the cell. Very small kai^osomo difl'erentiating to (iiie side in each 



daughter nucleus. 

 18, 19. ])eveloi)ing nierozoites. 

 20-22. Mcrozoitcs arranging themsehes "en barillet,"" with residual ])i'otoplasni 



in middle or to one end. 

 Several smaller and voungcr parasites siiuwii b\- the sidi' of the " liarillet " 



in fig. 22. 



Plate LVL 



Fig. 23, 24. Groups of merozoites, beginning to separate. 



Fig. 23 magnification 1400. Fig. 21 magniticatif)n 1600. 

 26. Small schizont, containing five young merozoites — seen in cross-section. 

 Ca'cnin. 



26. Macrogametncyte, with granules of reserve food-material. 



27. 28. Young macrogametocytcs. 



20. Longitudinal section of macrogamete, stained with Delafield's ha?niatoxy]in, 

 showing deeply staining chromatoid granvdes, a tew of which are 

 surrounded by clearer aii'as of plastin. 



30. Transverse section of older macrogamete, stained with iron ha'niatoxyliu 



and picro-fuchsin, with cyst just formed. Plastinoid granules well 

 defined ; chromatoid grannies (largely used in cyst formation) small 

 and in between the plastinoid granules. 



31, 32. Macrogametes, in section, as stained by Delatield's h:rmato.xylin. 



Chromatoid and plastinoid granules alternating. Plastinoid granules 



do not stain with ha>matoxylin. X lOOO. 



Young macropametocytes seen in the vicinity. 

 33, 34. Macrogametes with chromatoid and plastinoid granules, after careful 



staining with iron hematoxylin and picro-fucbsin. In fig. .S4 



chromatoid granules are seen passing to the periphery, to form the 



inner wall ot the mature macrogamete. 

 35, 36. Mature macrogametes. Remains of chromatoid granules seen attached 



to inner wall of cvst. 



