EXPLANATION OF PLATES 



All figures of Leidyopsis spltaerica gen. nov., sp. nov., from Termopsis angusti- 

 collis Walker, stained with iron haematoxyliu and dra^Ti with camera lucida. 

 Magnification 800 unless otherwise stated. 



PLATE 13 



Fig. 1. Optical section of trophozoite showing thickness and extent of ecto- 

 plasm, centroblepharoplast and nucleus with the two portions of endoplasm. 

 X 300. 



Fig. 2. Vertical view of anterior end showing centroblepharoplast with central 

 endoplasmic core, oblique fibers and nucleus slightly misplaced. 



Fig. 3. Centroblepharoplast with a few of the radiating oblique fibers. 



Fig. 4. Nucleus of the vegetative trophozoite; note the inner region filled 

 with a coarse network with granules interspersed along its nodes, the surrounding 

 alveolar zone and the outer granular region beneath the nuclear membrane. 



Fig. 5. Nucleus showing the heterochromosome and its vesicle. Alveolar 

 region has disappeared. 



Fig. 6. Early prophase nucleus showing formation and splitting of the 

 chromosomes. 



Fig. 7. Early prophase with the alveolar region breaking up. 



Fig. 8. Same stage as in figure 7. 



Fig. 9. Another phase of the breaking up of the chromatin network. 



Fig. 10. Anterior portion of the body, showing the cuplike depression with 

 its covering operculum, the tip of the centroblepharoplast, and the surface ridges. 



Fig. 11. Nucleus showing the full number of chromosomes. 



Beginning of the splitting of the centroblepharoplast and ectoplasmic 



A slightly later stage of same process as shown in figure 12. 

 Separation of the centroblepharoplast with the completion of the 

 paradesmose connecting them. 



Fig. 1.5. Same stage as in figure 14. 



Fig. 16. Prophase of nucleus and the first appearance of the spindle fibers. 

 Dark areas at the end of fibers are parts of the centroblepharoplasts. 



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