Dogfish Embryo

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“Embryo dogfish in egg-case ("mermaid’s purse") which has been cut open to show contents. e.g., “External” gills; d.f., dorsal fin fold; y.s., yolk-sac; st., stalk of yolk-sac; T., tendrils, prolongations of egg-case by means of which it is moored to seaweed, and “adaptation” in a dead substance.” -Thomson, 1916


Fish Anatomy


J. Arthur Thomson, M.A., LL.D. Outlines of Zoology (New York, NY: D. Appleton & Company, 1916)


TIFF (full resolution)

1474×2400, 398.8 KiB

Large GIF

628×1024, 61.1 KiB

Medium GIF

393×640, 32.0 KiB

Small GIF

196×320, 11.8 KiB