![A manual of zoology. Zoology. Fig. 540. Fig. 541. Fig. 540.—Shark embrj'O (from Boas), y, part of yolk sac; g. external gills in front of pectoral fins. Fig. 541.—Embrj'onic envelopes of A manual of zoology. Zoology. Fig. 540. Fig. 541. Fig. 540.—Shark embrj'O (from Boas), y, part of yolk sac; g. external gills in front of pectoral fins. Fig. 541.—Embrj'onic envelopes of](https://c8.alamy.com/comp/PG3NA4/a-manual-of-zoology-zoology-fig-540-fig-541-fig-540shark-embrjo-from-boas-y-part-of-yolk-sac-g-external-gills-in-front-of-pectoral-fins-fig-541embrjonic-envelopes-of-chick-schematized-after-duval-a-allan-tois-am-amnion-ait-eye-c-extraembryonic-ccelom-d-digestive-tract-do-yolk-sac-k-gill-clefts-m-mid-brain-i-2-hinder-and-anterior-extremities-the-whole-emlsryo-and-is-connected-with-the-rest-only-at-the-umbilicns-that-is-the-point-where-the-yolk-sac-projects-from-the-ventral-wall-in-this-sac-is-an-albuminous-amniotic-jhiid-the-amnion-is-genetical-PG3NA4.jpg)
A manual of zoology. Zoology. Fig. 540. Fig. 541. Fig. 540.—Shark embrj'O (from Boas), y, part of yolk sac; g. external gills in front of pectoral fins. Fig. 541.—Embrj'onic envelopes of
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