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Updated: June 2, 2025
But I am surprised to find the Sirenia left in one group with the Cetacea, and the Plesiosauria with the Ichthyosauria; the ordinal distinctness of these having, to my mind, been long since fully established.
The ancestors of Terebratulina caput serpentis may have been present at a battle of Ichthyosauria in that part of the sea which, when the chalk was forming, flowed over the site of Hastings.
What the Protamniota were like, I do not suppose any one is in a position to say, but I cannot think that the thoroughly Lacertian Protorosaurus had anything to do with them. The reptiles which are most amphibian in their characters, and therefore, probably, most nearly approach the Protamniota, are the Ichthyosauria and the Chelonia.
If I went below that, I should come upon the chalk, and there I should find something altogether different, the remains of ichthyosauria and pterodactyles, and ammonites, and so forth. I do not know what Mr.
The same truth is exemplified if we turn to certain great periods of the earth's history as, for example, the Mesozoic epoch. There are groups of reptiles, such as the Ichthyosauria and the Plesiosauria, which appear shortly after the commencement of this epoch, and they occur in vast numbers.
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