Abstract
THE immense number of short articles in this volume are as usual classified in a topical synopsis of the contents. The largest class is that of articles concerning the fisheries, the next in size contains those concerning aquiculture, the next those concerning natural history, and there are two other classes headed U.S. Fish Commission-General, and Miscellaneous. Of the biological articles Mr. John A. Ryder contributes only three, and the reader regrets there are not more from his hand. One is on the early development of the toad-fish, Batrachus tau, whose eggs are described as adherent, being fixed to the under surface of submerged boulders. The young toad-fish have this unique peculiarity, that when the egg-membrane bursts they are not set free but the lower surface of the yolk-sac remains firmly fixed to the adherent portion of the membrane, and this adhesion continues until the yolk-sac has become almost entirely intra-abdominal. The second of Mr. Ryder's papers is on the cleavage of the blasto-disk in the ovum of Raja erinacea; and the third on the intra-ovarian gestation of the viviparous Sebastes marinus: this last is based upon the examination of a gravid specimen obtained by the Albatross.
Bulletin of the United States Fish Commission.
Vol. VI., for 1886. (Washington: Government Printing Office, 1887.)
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Bulletin of the United States Fish Commission . Nature 37, 316 (1888). https://doi.org/10.1038/037316a0
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DOI: https://doi.org/10.1038/037316a0