. Comparative embryology of the vertebrates; with 2057 drawings and photos. grouped as 380 illus. Vertebrates -- Embryology; Comparative embryology. 418 GASTRULATION. AREA PELLUCIDA EMBRYONIC SHIELD NOTOCHORDAL CANAL OPENING ^PRIMITIVE STREAK AREA OPACA BEGINNING OF — HEAD FOLD. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Nelsen, Olin E. (Olin Everett), b. 1898. New York, Blakiston

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Keywords: ., bookcentury1900, bookcollectionbiodiversity, bookleafnumber444