126 ELECTRON-MICROSCOPIC STRUCTURE OF PROTOZOA 



Plate XII 



Fig. 42. Part of dried whole flagellum of Euglena gracilis fixed 

 at uncontrolled pH. x 18,000. From Pitelka and Schooley, 1955. 



Fig. 43. Part of dried whole flagellum of Euglena gracilis, fixed at 

 pH near that of culture medium, x 11,000. From Pitelka and 

 Schooley, 1955. 



Fig. 44. Dried empty pellicle of detergent-treated Euglena gracilis. 

 The two poles are nearly superimposed. Upper arrow indicates 

 whorl of fibers at posterior pole. Lower arrows show lateral whorls 

 at anterior pole, on either side of neck of reservoir, x 3,600. 

 From D. R. Pitelka and C. N. Schooley, unpublished. 



Fig. 45. Small part of dried pellicle of detergent-treated Euglena 

 gracilis, x 40,000. From D. R. Pitelka and C. N. Schooley, 

 unpublished. 



Fig. 46. Longitudinal section through anterior end of Euglena 

 gracilis, showing longitudinal and radial fibrils around neck of 

 reservoir, x 14,000. From Roth, 1958a. 



Fig. 47. Section of Euglena gracilis nearly perpendicular to cell 



surface, showing hooked profiles of pellicular ridges, cross-sections 



of 2 or 3 tubular fibrils in cytoplasm at left side of each ridge. 



X 49,000. From S. P. Gibbs, unpublished. 



