oo" 
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FIG. 
ise: 
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OI Anew ws 
9. 
LANGENBECK. 
EXPLANATION OF PLATE XXVI. 
4-cell stage. 
8-cell stage from micromere pole. 
16-cell stage from macromere pole. 
16-cell stage from micromere pole. 
22-24-cell stage from macromere pole. 
22~-24-cell stage looking down upon GZ cells. 
22~-24-cell stage seen from CJD side. 
22~24-cell stage looking down upon ZF cells. 
Section of an egg of forty-five cells passing through the two blasto- 
meres found in the blastocoel. 
ides, 11}, 
blastoc 
FIG 
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Fie. 
oel. 
5 iti. 
12. 
cP 
14. 
rg 
16. 
Te 
Section of the same egg shown in Fig. 7 passing through the 
28-40-cell stage looking down upon the g% cells. 
28—40-cell stage looking down upon the G/ cells. 
40-cell stage showing x and y cells. 
73-cell stage looking down upon the ZF group. 
73-cell stage from micromere pole. 
73-cell stage looking down upon the GH group. 
1o02-cell stage from the macromere or ventral pole after the blasto- 
derm has risen to the surface of the egg. 
FIG. 
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18. 
19. 
20. 
Micromere or dorsal pole of the egg shown in Fig. 17. 
Optical section of an egg passing from the 2 into the 4-cell stage. 
Section of an egg of forty-three cells, showing one cell with the 
spindle at right angles to the surface of the egg. 
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FIG. 
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21. 
22. 
a5. 
24. 
25. 
26. 
44—-46-cell stage looking down on #F group. 
30-42-cell stage looking down on #F group. 
30-42-cell stage looking down on GH group. 
30-42-cell stage seen from micromere pole. 
Section of an egg of the 8-cell stage. 
Section of an egg of 72-cell stage. 
