Jenninas, — Asplanchna, 
PLATE 3. 
Fig. 17. Right side of the eight-cell stage, same egg as that seen in Figures 13, 14, 
and 15, showing the lateral extension and beginning of division of the 
asters in c* and c#2, 
Fig.18. Right side of a slightly older stage than Figure 17, showing the com- 
pletion of the division of the asters. In c*1 the line joining the asters 
is lateral; in ct? it has already become oblique. 
Fig. 19. Right side of a stage later than that shown in Figure 18, containing nine 
cells. The line joining the asters in c has become dorso-ventral, 
while that joining those of c*! has become oblique. The cleavage of 
du into d^! and d^? has occurred (compare Fig. 16), while d*? is 
still undivided, 
Figs. 20-25. Different views of an egg in the ten-cell stage, to show the position of 
the spindles in relation to the exact form and dimensions of the cells. 
Fig. 20. Right side of a stage later than Figure 19, but containing still only ten 
cells. The line joining the asters in ct! has become dorso-ventral and 
the spindle is formed between them. Likewise in c.; di has divided 
into dè? and d54, 
Fig. 21. Anterior surface of the egg represented in Figure 20; the spindles occupy 
the shorter axes of 0* and 042, 
Fig. 22. Left side of same egg showing the nuclear conditions in quadrant 4. 
'The spindles are not yet formed. 
Fig. 29. Right face of optical, nearly sagittal, section, through quadrants B and 
D,from the egg shown in the three preceding figures, to exhibit the 
exact dorso-ventral extent of the cells 0*1 and 0^?, as compared with 
the lateral extent of the same cells in 
shown 
Fig. 24. Dorso-ventral, approximately frontal, 
in Figures 20-28, showing the £ tral extent of the 
" g 
of 
‘ison with the late 
20 and 22. 
ce 
ral dimen 
quadrants A and C, for « 
sions of the ss 
25. Posterior surface re shown in Figures 20-24. 
