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EXPLANATION OF PLATE X. 
All figures were outlined with the Abb6-Zeiss camera lucida, using a 2 mm. apochro- 
matic (Zeiss) or inch achromatic (Zeiss) objective, and compensating oculars 8 and 12. 
The magnification is approximately 1300 diameters except where otherwise stated. 
Figs. 1-8. Pre-flagellate stages of Crithidia pulicis. 
Fig. 1. Large pre-flagellate showing well-marked nucleus with karyosome and distinct 
blepharoplast. 
Fig. 2. Smaller pre-flagellate x 1950. 
Fig. 3. Rosette of pre-flagellates, beginning to elongate. 
Fig. 4. Pre-flagellate, showing commencement of differentiation of flagellum. 
Fig. 5. Rosettes of pre-flagellates showing slight variation in the shape and position of the 
blepharoplast and in the extent of elongation. 
Figs. 6, 7. Elongating forms. 
