EXPLANATION OP PLATES 



All figures of Chilomastix mesnili were drawn with camera from Schaudinn-iron 

 haematoxyliu preparations at a uniform magnification of 4800. Finer structures 

 have been worked out with high-power monobjeetive binocular microscope with 

 strong illumination, fluorite and apochromatic objectives, wide-angle condenser and 

 immersion oil between slide and condenser. 



PLATE 15 



Fig. 1. Normal trophozoite showing the spiral groove, the eytostome with 

 its peristomal fiber, eytostomal flagellum, parabasal and parastyle, the nucleus 

 anteriorly located, and the three blepharoplasts and centrosome. 



Fig. 2. Small flagellate which is preparing to encyst or may have just escaped 

 from a cyst. 



Fig. 3. Free flagellate showing the deep notch of the spiral gi'oove. The 

 blepharoplast complex appears as a single granule. 



Fig. 4. The large vacuoles show the position of glycogen masses in the living 

 flagellates. The black rods represent ingested bacteria. Spiral groove obliterated 

 by contraction. 



Fig. 5. Chilomastix viewed from the ' ' dorsal ' ' or aboral side. The eytostome 

 is partly engulfed by the deep spiral groove. 



Fig. 6. Chilomastix of the more slender type. 



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