EXPLANATION OF PLATES 



Figures in plates 7 and 14 are diagrammatic, those of plate 7 being based 

 upon observations of living and stained material, plate 14 being sketched from 

 camera lucida drawings of accompanying plates. Figures in plates 8 to 13 are 

 camera lucida sketches. All figures except plate 13, figure 62, are of Collodictyon 

 triciliatum Carter, killed in hot Schaudinn 's fluid and stained in Heidenhain 's 

 aqueous iron-alum haematoxylin, unless otherwise stated. X 1700. 



PLATE 7 



Fig. 1. Laterosulcal view, showing vacuolated cytoplasm, sulcus, vesicular 

 nucleus with karyosome and peripheral chromatin, blepharoplast of two basal 

 granules surrounded by granular archoplasm, four flagella, and rhizoplast. 



Fig. 2. Absulcal view, showing bifurcated posterior end, nucleus, blepharo- 

 plast, and flagelia. 



Fig. 3. Sulcal view, showing median sulcus, posterior bifurcation, nucleus, 

 blepharoplast and flagella. 



Fig. 4. Anterior view, showing sulcus, nucleus, blepharoplast, rhizoplast, 

 and four flagella. 



Fig. 5. Sulcal view of truncated posterior end; two cusps. 



Fig. 6. Sulcal view of truncated posterior end; three cusps. 



Fig. 7. Laterosulcal view of truncated posterior end; four cusps. 



Fig. 8. Laterosulcal view of truncated posterior end; five cusps. 



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