60 ELECTRON-MICROSCOPIC STRUCTURE OF PROTOZOA 



Plate V 



Fig. 17. Tangential section at surface of nucleus of Bodo saltans 

 showing pores or annuli, each with single dense particle at center. 

 Abundant Palade particles on cytoplasmic side of nuclear envelope. 

 X 45,000. 



Fig. 18. Section through cortex of Amoeba proteus nucleus, showing 

 double nuclear envelope and honeycomb layer inside envelope; 

 irregular dense peripheral nucleoli. X 27,000. From Roth, 

 Obetz and Daniels, 1960. 



Fig. 19. Oblique section near surface of nucleus of Amoeba 

 proteus, showing cortical honeycomb layer. X 31,000. From Roth, 

 Obetz and Daniels, 1960. 



Fig. 20. Cross-section through small part of metaphase spindle of 

 Amoeba proteus. Tubular profiles of spindle fibers aggregated in 

 clusters or bands, surrounded by clouds of fine material. X 70,000. 

 From L. E. Roth. 



Fig. 21. Section from Amoeba proteus interphase nucleus showing 

 helices linked in linear aggregates. X 31,000. From Roth, Obetz 

 and Daniels, 1960. 



Fig. 22. Small area from longitudinal section of Amoeba proteus 

 metaphase nucleus, showing tubular spindle fibrils and small, 

 densely fibro-granular chromosomes. X 54,000. From L. E. Roth. 



The micrographs presented in Figs. 20, 22 and 23 have been 

 published by L. E. Roth and E. W. Daniels, 1962, /. Cell Biol., 12, 

 57-78. 



