. Elementary text-book of zoology. COLUMBA. 379 are optical distinctions and there is no real morphological distinction between the two areas. Fig. 274.—Cross-section through a Blastoderm of ABOUT 24 hours. A Neural Groove. Hypoblast.. Epiblast. Yolk. Archenteron. Mesoblast. Notochord. A shows the whole blastoderin lymg on the yolk. B shows the median part only more highly magniiied. fig. 275.—Transverse Section of an Embryo Chick of the Second Day. {Ad nat.) (Slightly diagrammatic.) Lateral Fold of Amnion. Extra-embryonic Coalom. Nerve Cord. Notochord. Protovertebra. Amniotic Fold.. Please n

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. Elementary text-book of zoology. COLUMBA. 379 are optical distinctions and there is no real morphological distinction between the two areas. Fig. 274.—Cross-section through a Blastoderm of ABOUT 24 hours. A Neural Groove. Hypoblast.. Epiblast. Yolk. Archenteron. Mesoblast. Notochord. A shows the whole blastoderin lymg_ on the yolk. B shows the median part only more highly magniiied. fig. 275.—Transverse Section of an Embryo Chick of the Second Day. {Ad nat.) (Slightly diagrammatic.) Lateral Fold of Amnion. Extra-embryonic Coalom. Nerve Cord. Notochord. Protovertebra. Amniotic 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 work.. Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone