There are many difficulties in the way of understanding this
partial segmentation and the gastrula that arises from it. We have
only recently succeeded, by means of comparative research, in
overcoming these difficulties, and reducing this cenogenetic form
of gastrulation to the original palingenetic type. This is
comparatively easy in the small meroblastic ova which contain
little nutritive yelk--for instance, in the marine ova of a bony
fish, the development of which I observed in 1875 at Ajaccio in
Corsica.
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