26 Maurice Crozvthcr Hall 



EXPLANATION OF PLATE 



Figs. 1-6. Views of Sections of Gregarines 



Fig. 1. Cross-section of Hirmocystis rigida showing external folding of 

 the sarcocyte and the fibers in the sarcocyte. X 500. Section 3 m thick. 



Fig. 2. Longitudinal section of H. rigida m the region of the septum, 

 showing the formation of the septum. • X 1600. Section 3 m thick. 



Fig. 3. Longitudinal section of H. rigida showing the fibers of the sar- 

 cocyte cut in cross-section. X 1600. Section 2 m thick. 



Fig. 4. Longitudinal section through the protomerite of H. rigida show- 

 ing the fibers of the sarcocyte. Highly magnified. Section 2 i^ thick. 



Fig. 5. Cross-section of H. rigida, showing the cuticular lamellae and 

 the fibers of the sarcocyte. Highly magnified. Section 1 /* thick. 



Fig. 6. View of the cuticular lamellae at the posterior end of the deuto- 

 merite of H. rigida. Highly magnified. Section 2 m thick. 



Figs. 7-21. Views of Toto Mounts. 



Fig. 7. Conjugates of H. rigida crushed and stained with saffranin to 

 show longitudinal striation. X 133. 



Fig. 8. Type specimen of H. rigida. X 105. 



Fig. 9. View of young gregarine showing median depression in epi- 

 merite. X 500. 



Fig. 10. View of young gregarine showing reduced epimerite. Highly 

 magnified. 



Fig. 11. Protomerite of H. rigida showing anterior thickening of the 

 sarcocyte and its median depression. X 165. 



Fig. 12. Gregarine conjugation from Chiiiiarocrphalus Z'iridifasciata. 

 X 110. 



Fig. 13. Solitary white gregarine from Mclanophis. X 113. 



Figs. 14-20. Views showing variations of septum and protomerite in 

 young gregarines. Highly magnified. 



Fig. 21. H. rigida impregnated with gold to show folding of sarcocyte. 

 X 113. 



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