SOME ASPECTS O F T H E BIOLOGY O F THE CHAETOGNATHS
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F I G . 18. Some stagcs in the cleavage of the eggs i n 8 . inJata. Lower right: gastrula
seen from the blastopore and sideways. On the bottom of the archenteron the germ
cells can be discerned.
317
F I G . 18. Some stagcs in the cleavage of the eggs i n 8 . inJata. Lower right: gastrula
seen from the blastopore and sideways. On the bottom of the archenteron the germ
cells can be discerned.