. Chimæroid fishes and their development. Fishes; Chimaeridae. Figs. 27-29.—Egg-capsules of Chimaera colliei, partly opened, so as to show egg and young. Natural size. 27. Early embryo (about 32 days), showing subdivision of yolk material. 28. Late embryo (about 5 months), showing external gills and miniature sac. At this time the embryo is bathed in a heavy milky fluid resulting from conbnued subdivision of yolk masses. 29. Young Chimeera at about the time of hatching I? eight months). The capsule at this period is greatly weathered and develops a tension which probably aids the operculum in
. Chimæroid fishes and their development. Fishes; Chimaeridae. Figs. 27-29.—Egg-capsules of Chimaera colliei, partly opened, so as to show egg and young. Natural size. 27. Early embryo (about 32 days), showing subdivision of yolk material. 28. Late embryo (about 5 months), showing external gills and miniature sac. At this time the embryo is bathed in a heavy milky fluid resulting from conbnued subdivision of yolk masses. 29. Young Chimeera at about the time of hatching I? eight months). The capsule at this period is greatly weathered and develops a tension which probably aids the operculum in springing open and permitting the young to escape. sac, and before hatching becomes large in size and has many features of the adult, , mixipterj'gia in the case of the male. By far the most remarkable featui"e during this process of development is the behavior of the yolk. This undergoes vacuolization, followed by fragmentation. Of the 3'olk a small portion only is inclosed within the sac of the young ; the remainder continues to fragment, form- ing a cream}' mass which nourishes the embryo via external gills and gut. The fragmentation, we have reason to believe, is an extreme modification of the process of 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 Dean, Bashford, 1867-1928. Washington, D. C. , Carnegie Institution of Washington
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectfishes, bookyear1906
