Abstract
II.
IT is well known that the eggs of sharks and rays, when deposited, are enclosed in a strong horny capsule or “purse “formed as a secretion from the oviduct. In both groups these curious appendages have the form of a pillow-case, the corners being pointed in the rays, and produced into long tendril-like processes in the shark and dog-fish. The embryo remains enclosed in the purse until about six months after oviposition, and it is during this period that all the most important metamorphoses are gone through.
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Report of Prof. Parker's Hunterian Lectures “On the Structure and Development of the Vertebrate Skull”*. Nature 9, 467–468 (1874). https://doi.org/10.1038/009467a0
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DOI: https://doi.org/10.1038/009467a0