390 Davis. — On Euglenopsis : an Alga-like Organism. 
EXPLANATION OF FIGURES IN PLATE XIX. 
Illustrating Mr. Davis’ paper on Euglenopsis. 
All figures drawn from nature and sketched with an Abbe camera. Fig. i 
magnified 250 diameters, all others 750 diameters. 
Fig. 1. Specimen showing habit of plant. x 250. 
Fig. 2. Tip of branch, showing terminal cell at a time when it is growing 
forward, illustrates the appearance of the protoplasmic processes at the posterior 
end of the cell ; three cross- walls are between the cell and the empty cell-cavity 
just below it. 
Fig. 3. End of a branch illustrating a case in which four cells have been derived 
from one. The first division of the original cell was oblique in a longitudinal 
direction, and then each of the two cells thus formed divided again in a plane at 
right angles to the plane of the first division. 
Fig. 4. A zoospore at the end of a branch still enclosed in the terminal com- 
partment, the cilia were moving slowly when the drawing was made. Four 
cross-walls between the terminal compartment and the one adjacent to it. 
Fig. 5. Zoospore killed with Flemming’s fluid. 
Fig. 6. Zoospore just settled down preliminary to germinating ; drawn from a 
specimen in a Van Tieghem cell. 
Fig. 7. Young plant twelve hours old. 
Fig. 8. Young plant thirty-six hours old, with one empty compartment. 
Fig. 9. Young plant thirty-six hours old; cell has divided obliquely after 
forming two cross-walls at the base. 
Fig. 10. Young plant thirty-six hours old ; cell has divided at right angles to 
the long axis of the plant. 
Fig. 11. Plant thirty-six hours old with one empty compartment. 
Fig. 12. Plant about two and a half days old. 
