PLATE 8 
EXPLANATION OF FIGURES 
91 Taken from the same series as figures 88 to 90; eighth section from the top. 
92 Horizontal section of an eighteen-cell stage; sixth section from the top; 
shows the neuroblasts and nephroblasts. 
93 Same as the preceding; tenth section from top; this figure shows the per- 
sistence of the cleavage spindles after the cell membranes are distinct. 
94 Same as 92 and 93; fourteenth section from top; taken from a series of 20 
section each eight micra thick. This figure shows the upper side of the macro- 
mere D wedged in between the other cells. 
95 Transverse section of an embryo represented by figure 64; section taken 
at plane 2 — 2, or at a region corresponding to plane 2 — 2, of figure 98. 
96 Transverse section of stage corresponding to figure 63; section taken at 
plane 2 — 2; figures 95 and 96 shows germ bands only partially covered by the 
ectoderm. 
97 Transverse section of embryo represented in figure 69; section taken at 
level marked by line 2 — 2; here the germ bands are completely covered by the 
ectoderm. 
98 Longitudinal section, near median line, of stage represented by figure 69. 
99 Longitudinal section of an embryo represented by figure 71; plane of 
section near median line. 
196 
