. The germ-cell cycle in animals . Cells. 32 GERM-CELL CYCLE IN ANIMALS of origin and the germinal ridge is too great to be traversed in any other way. Professor B. M. Allen, who has made extensive studies of the germ cells of many species of verte-. FiG. 6. — Diagrams showing the paths of migration in A, a turtle, Chrysemys marginala; B, a frog, Rana pipiens; C, a fish, Lepidos- teus osseus, and D, the dog-fish, Amia calva. (From Allen, 1911.) 4re/i = archenteron; /n(. = intestine; Lat. Afes = lateral plate of mesoderm; Mes = mesentery; Meson = mesonephros; Myo = myo- tome; A'^oto = notochord
. The germ-cell cycle in animals . Cells. 32 GERM-CELL CYCLE IN ANIMALS of origin and the germinal ridge is too great to be traversed in any other way. Professor B. M. Allen, who has made extensive studies of the germ cells of many species of verte-. FiG. 6. — Diagrams showing the paths of migration in A, a turtle, Chrysemys marginala; B, a frog, Rana pipiens; C, a fish, Lepidos- teus osseus, and D, the dog-fish, Amia calva. (From Allen, 1911.) 4re/i = archenteron; /n(. = intestine; Lat. Afes = lateral plate of mesoderm; Mes = mesentery; Meson = mesonephros; Myo = myo- tome; A'^oto = notochord; P. card = post cardinal vein; 5. C = sex- cells; = sex gland; Vit. Snd = vitelline endoderm; = Wolffian duct. brates, makes the following statement regarding this phase of the germ-cell cycle : "The sex-cells are migratory to a high degree. The path and time of their migration may vary greatly within a given group of animals, as illus-. 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 Hegner, Robert William, 1880-1942. New York : The Macmillan Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectcells, bookyear1914
