^ 





ILLUSTRATIONS 



Figures 



1. General morphology of Ur onychia trans juga 16 



2. Uronychia trans juga; merotomy and regeneration ... 17 

 3A. Uroleptus mobilis; stages in the fusion of the macronuclei 



prior to cell division 



3B. Uroleptus mohilis; the nuclei in late division stages 



4. Nuclear clefts in the macronuclei of Uroleptus halsey't . 



5. Conchophthirus mytili; extrusion of chromatin, during divi 



sion 



6. Aspidisca lynceus; stages in macronuclear reorganization 



during division 23 



7. Lophomonas blattarum; division and reorganization of the 



nucleus 



8. Chilodonella uncinatus; replacement of pharyngeal basket 



and mouth 



9. Uroleptus mohilis; old-age specimens showing the degenera- 



tion of the macronucleus and the loss of micronuclei . 



10. Uroleptus mohilis; graph representing the life history by 



ten-day intervals 30 



11. Glaucojna [Dallasia) front ata; general morphology of a 



vegetative individual 32 



12. Gametogenesis in Glaucoma (Dallasia) frontata .... 33 



13. Uroleptus mohilis; conjugation and merotomy 34 



14. Uroleptus mohilis; formation of the new macronucleus after 



conjugation 37 



15-16. Mitochondria in Lechriopyla mystax 114 



17. Ichthyophthirius multifiliis; series showing mitochondria and 



the secretion of paraglycogen 114 



18-21. De novo origin of mitochondna. in Monocystis . . . . 114 



22-25. Mitochondtis. in Amoeba proteus 114 



26-27. Mitochondria and protein reserves in Aggregata eberthi 114 



28-29. Mitochondria in conjugants of Bursaria truncatella . . 114 



19 

 20 

 21 



22 



26 



27 



29 



