360 WOOLFORD B. BAKER. 



, EXPLANATION OF FIGURES. 



PLATE I. 



All sketches were made with camera lucida with Leitz compens ocular (20) and 

 Leitz apo. obj. 1.5. They have been reduced one half. 



FIG. i. Euglena agilis in vegetative condition showing nucleus, endosome, 

 chromatophores with pyrenoids, blepharoplast, basal body, flagellar enlargement, 

 reservoir, gullet or cytopharynx, and kinetic residue. The stigma or eyespot does 

 not show with the stains used. The chromatin is arranged in a net work. 



FIG. 2. Early prophase drawn in optical section showing first stages in for- 

 mation of chromosomes and early budding of the kinetic complex from the endosome. 



FIG. 3. The chromosomes appear as elongated rods or loops and give the 

 appearance of a spireme. The bud from the endosome is definitely connected by 

 a rhizoplast. 



FIG. 4. The granule budded from the endosome has divided, the daughter 

 halves passing along the periphery of the nucleus. One is connected by rhizoplast 

 to the endosome. 



FIG. 5. Another view of the daughter granules separating on the nuclear 

 membrane. The animal is beginning to round up and the nucleus is approaching 

 lower border of the reservoir. 



FIG. 6. The endosome has elongated, each daughter half of the kinetic complex 

 has given rise to a blepharoplast and this in turn to a basal body. From both the 

 blepharoplast and basal body a flagellar element has grown out. The remainder of 

 the old flagellum is seen in the right side of the figure. The pyrenoids of the 

 chromatophous are undergoing change in organization. The chromosomes are 

 arranged around the elongated endosome. 



FIG. 7. An optical section of a late prophase or metaphase with chromosomes 

 arranged somewhat radially around the endosome. Each chromosome shows a 

 longitudinal split and the looped nature of each gives the appearance of a pairing. 



FIGS. 8-10. Stages in the anaphase, showing separation of the daughter 

 chromosomes and the formation of an equatorial cylinder. The rhizoplast con- 

 necting the blepharoplast to the residue of the kinetic complex is visible in figure 

 eight. 



