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DESCRIPTION OF PLATE VIII. 
The figures in this Plate show the oocysts of the three human intestinal coccidia described in 
the text. They were all drawn originally at a uniform magnification (approximately 2000 dia¬ 
meters), and have been reduced to the size here shown (1600 diameters) in the process of repro¬ 
duction. Figs. 1 and 3 were drawn, under a 2 mm. apochromat (N.A. = 1*40), from living oocysts. 
Fig. 2 is copied, with very slight modification, from Wenyon (1915 b). The oocysts are shown as 
they usually appear in freshly passed human faeces—those of the two species of Eimeria containing 
fully formed spores, that of the Isospora with its contents still unsegmented. (The fully developed 
oocyst of this species, containing two tetrazoic spores, is shown in Text-fig. 1, B, p. 177.) 
Fig. 1. Isospora hominis Rivolta (emend.). Undeveloped oocyst. 
Fig. 2. Eimeria wenyoni n.sp. Fully developed oocyst and spores. 
Fig. 3. Eimeria oxyspora n.sp. Fully developed oocyst and spores. 
