ZOOFLAGELLATES 



157 



OUTER 



ECTOPLASM 



MIDDLE 



ECTOPLASM 



OUTER 



ECTOPLASM 

 MIDDLE 



ECTOPLASM 

 CIRCULAR 



FISSURE 



PARABASAL 



FILAMENT 

 MITOCHONDRIA? 



Text-figure 10. Schematic drawings of the anterior end of 



Tricbonympha. Below: body surface shown at left, cut away to 



reveal internal structures at right. Above: section representing 



plane indicated by oblique broken line on lower figure. From 



Pitelka and Schooley, 1958. 



