CuKTis.— Planaiia. 
PLATE 13. 
(The figure.s are from camera liicida outlines of sections and are reduced 
three fourths in the reproduction.) 
Fig. 35. A sagittal section thnmgh the anterior portion of a tail piece a few 
hours after its normal fission (see figure 2 which represents the exter¬ 
nal features of such a piece). The parenchyma is seen to be naked 
at the cut surface. The anterior end is to the left. Zeiss D X 2. 
Fig. 36. A sagittal section through the anterior end of a tail piece on the day 
following fission (see figure 3). At the naked end is to be seen what 
is interpreted as the production of the new ectoderm (ec') by forma¬ 
tive cells. The anterior is to the left. Zeiss D X 2. 
