Miscellany | Published:

Biological Notes


    OBSERVATIONS ON THE EMBRYOLOGY OF THE TELEOSTS, by J. S. Kingsley and H. W. Conn. The observations were made during the summers of 1881 and 1882 at the Summer Laboratory of the Boston Society of Natural History at Annisquam, Mass., on the egg development of Ctenolabrus cœruleus. The eggs were obtained by surface skimming, and were usually equally abundant during the day and in the evening, and as a rule were more so on the flow than on the ebb of the tide. Half an hour's skimming would produce on an average 150 eggs. These eggs all floated at or near the surface of the water, and presented a marked contrast to those of either an Elasmobranch, Batrachian, Reptile, or Bird, in that the germinative portion is invariably downward or on the lower surface of the egg, while the deutoplasm is uppermost. The stages observed were: the maturation of the ovum, the phenomena of segmentation until the formation of the germ layers, the formation of the three primary layers, the segmentation cavity, the invagination of the hypoblast, and the appearance of nuclei in the intermediary layer of Van Bambeke, the formation of the notochord and neural cords, the former arising from the hypoblast at first as a longitudinal median thickening of that layer, and subsequently becoming segmented off and taking its place among the mesoblastic tissues, the development of the optic bulbs and protovertebræ.

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