. Elementary text-book of zoology. Eye. Stomodseum, 'Sucker. Notochord. Pronephric A Longiludinal Median Section through an Embryo of Frog X 20 (after Marshal!.). Note the dorsal nerve-tube swollen into a brain anteriorly, the noto- chord below it, and the mass of yolk-cells on the ventral wall of the archenteron. B, Side (right) View of just-hatched Tadpole of Frog X 6 ifld nat.). C, Median Longitudinal Section through a newly-hatched Frog's Tadpole (chiefly after Marshall). Alriozoa. As in the case of the gastrula, the chief difference is in the presence of a large mass of yolk contai

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. Elementary text-book of zoology. Eye. Stomodseum, 'Sucker. Notochord. Pronephric A Longiludinal Median Section through an Embryo of Frog X 20 (after Marshal!.). Note the dorsal nerve-tube swollen into a brain anteriorly, the noto- chord below it, and the mass of yolk-cells on the ventral wall of the archenteron. B, Side (right) View of just-hatched Tadpole of Frog X 6 ifld nat.). C, Median Longitudinal Section through a newly-hatched Frog's Tadpole (chiefly after Marshall). Alriozoa. As in the case of the gastrula, the chief difference is in the presence of a large mass of yolk containing hypoblast on the ventral wall of the 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 Masterman, Arthur Thomas. Edinburgh, E. & S. Livingstone

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Keywords: ., bookcentury1900, bookcollectionbiod, bookdecade1900, bookyear1902