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Really, by-the-by, I cannot give you a better instance of what I mean, than in my little diatribe on the Geryon Trifurcifer, a small reptile which I found, some years ago, inhabiting the mud of the salt lakes of Balkhan, which fills up a long-desired link between the Chelonia and the Perenni branchiate Batrachians, and, as I think, though Professor Brown differs from me, connects both with the Herbivorous Cetacea, Professor Brown is an exceedingly talented man, but a little too cautious in accepting any one's theories but his own.
But there is no reason to suppose that a congenital defect of thyroid arising as a mutation was the original cause of the neoteny, i.e. the peisistence of the larval or aquatic, branchiate condition. Such a supposition would imply that the association between Axolotls and the peculiar Mexican lakes, supplied with oxygenated water by springs at the bottom, was purely accidental.
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