. Zoology : for students and general readers . Zoology. 66 ZOOLOGY. such as the medusfe of the Ilydroids and the Trachy- In the European JSfausitJioe albida and Pelagia nocMluca no nerve-ring is present, for this is impossible owing to their deeply indented disks. There are instead eight. Fiff. 44.—Gastrula of an Aure- lia-Iike Afedusa. a, primitive month; b, gJlstro-vasculav cavity; c. ectoderin; d, ejidoderm.— After Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance

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. Zoology : for students and general readers . Zoology. 66 ZOOLOGY. such as the medusfe of the Ilydroids and the Trachy- In the European JSfausitJioe albida and Pelagia nocMluca no nerve-ring is present, for this is impossible owing to their deeply indented disks. There are instead eight. Fiff. 44.—Gastrula of an Aure- lia-Iike Afedusa. a, primitive month; b, gJlstro-vasculav cavity; c. ectoderin; d, ejidoderm.— After 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 Packard, A. S. (Alpheus Spring), 1839-1905. New York : Henry Holt

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Keywords: ., bookcentury1800, bookdecade1870, booksubjectzoology, bookyear1879