Abstract
II. In those huge marine reptiles of the secondary period, the Ichthyosaurus and the Plesiosaurus, we meet with the most complete serial symmetry between the fore and the hind limbs. In the Plesiosaurus, not only are the bones of the hand and foot completely alike, but the same is the case with those of the upper arm and thigh and those of the fore-arm and leg.
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References
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MIVART, S. THE GENESIS OF LIMBS 1 . Nature 18, 309–311 (1878). https://doi.org/10.1038/018309a0
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DOI: https://doi.org/10.1038/018309a0