Book - Vertebrate Zoology (1928) 16: Revision history

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25 April 2015

  • curprev 12:3712:37, 25 April 2015Z8600021 talk contribs 14,421 bytes +14,421 Created page with " CHAPTER XVI THE EMBRYONIC MEMBRANES The Yolk-sac. — In those forms in which the quantity of yolk contained in the egg is large, the embryo is formed from a blastoderm o..."