STUDIES IN THE LIFE HISTORIES OF EUGLENIDA

1. The structures of living and stained Distigma proteus Ehbg. and Astasia dangeardi Lemm. are shown and compared.2. Formation of yellow pentagonal cysts is noted for Distigma.3. Distigma has 16 chromosomes, Astasia has 12. In both animals they are elongate and somewhat beaded. They form irregular metaphase plates and by a separation of halves of the longitudinal chromosomes, surround the endosome with a cordon of rod-like chromosomes.4. The final parting of the two daughter chromosomes is as a rule at one end, but it simulates a transverse break.5. Individual chromosomes may persist in the nuclei of daughter cells of D. proteus even after separation, but in A. dangeardi reorganization of the nuclei is complete by the time the cells separate.6. Mitosis is anastral in these organisms, there being no centrioles, asters, or spindles.7. The endosome seems to take the place of the spindle.8. The blepharoplasts do not function as division centers, but do divide, or bud off daughter blepharoplasts.9. One daughte...