The reptiles which are most amphibian in their characters, and therefore, probably, most nearly approach the Protamniota, are the Ichthyosauria and the chelonia.
"Critiques and Addresses"
Thomas Henry Huxley
At the present day the chelonia alone include oceanic, fresh-water, and terrestrial forms.
"Hormones and Heredity"
J. T. Cunningham
Similarly, in reptiles the chelonia are distinguished by the most extraordinary union of skin-bones and internal skeleton enclosing the body in rigid armour: it may be said that the function of this is protection, that it is adaptation, and can be explained by natural selection, but the adaptation in this case is so indefinite that it is difficult to be convinced of it.
"Hormones and Heredity"
J. T. Cunningham