Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . atin-al length. M. C. Z. Nearly natural length. M. C. Z. Two thirds natural Twice natural Natural M. C. Z. 1305. Figure 1 represents the egg in its membranous envelope before the appearance of the 2-4 show the embryo with the egg near the time the latter attaches to the wall of theoviduct, the attachment being a consequence of active development of the blood vessels and rapiddepletion of the nutriment of the egg. Partially attached eggs, be

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Memoirs of the Museum of Comparative Zoölogy, at Harvard College, Cambridge, Mass . atin-al length. M. C. Z. Nearly natural length. M. C. Z. Two thirds natural Twice natural Natural M. C. Z. 1305. Figure 1 represents the egg in its membranous envelope before the appearance of the 2-4 show the embryo with the egg near the time the latter attaches to the wall of theoviduct, the attachment being a consequence of active development of the blood vessels and rapiddepletion of the nutriment of the egg. Partially attached eggs, before entire disappearance, are con-siderably modified on the side in contact with the wall to which after the egg is absorbed the attached by the cord. The egg of Squalus, fig. 5 and 7, is one that carries a sufficient amountof nutriment for the development and growth of the embryo without attachment to the surroundingwalls. The distribution of the blood vessels over the yolk differs much from that in fig. 2-4. Mfm. Mus. Comp Vol. 36 PLAGiosTOMts. Plate

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1913