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The same view was afterwards confirmed by Professor Owen, who also pointed out the resemblance of the cranial plates to those seen in the skull of Archegosaurus and Labyrinthodon. Footprints of two reptiles of different sizes had previously been observed by Dr. Harding and Dr.
BRITISH. Coal-measures of South Wales, with underclays inclosing Stigmaria. FOREIGN. Coal-field of Saarbruck, with Archegosaurus. BRITISH. Mountain limestone of Wales and South of England. FOREIGN. Mountain limestone of Belgium. BRITISH. Yellow sandstone of Dura Den, with Holoptychius, etc. FOREIGN. Clymenien-kalk and Cypridinen-schiefer of Germany.
The Archegosaurus, which we have figured, and the Anthracosaurus, are forms which appear to have existed in great numbers in the swamps and lakes of the age. The fish of the period belong almost entirely to the ancient orders of the ganoids and placoids. Of the ganoids, the great megalichthys Hibberti ranges throughout the whole of the system.
Hermann von Meyer, again, to whose luminous researches we are indebted for our present large knowledge of the organization of the older Labyrinthodonts, has proved that the Carboniferous Archegosaurus had very imperfectly developed vertebral centra, while the Triassic Mastodonsaurus had the same parts completely ossified.
Hermann von Meyer, again, to whose luminous researches we are indebted for our present large knowledge of the organization of the older Labyrinthodonts, has proved that the Carboniferous 'Archegosaurus' had very imperfectly developed vertebral centra, while the Triassic 'Mastodonsaurus' had the same parts completely ossified.
It is much larger than that of any known living species of the same genus. Archegosaurus minor, Goldfuss. Imbricated covering of skin of Archegosaurus medius, Goldf.
Wonderful accumulations of fish remains are found at the base of the system, in the bone-bed of the Bristol coal-field, as well as in a similar bed at Armagh. Many fishes were armed with powerful conical teeth, but the majority, like the existing Port Jackson shark, were possessed of massive palates, suited in some cases for crushing, and in others for cutting. Archegosaurus minor.
Hermann von Meyer, again, to whose luminous researches we are indebted for our present large knowledge of the organisation of the older Labyrinthodonts, has proved that the Carboniferous Archegosaurus had very imperfectly developed vertebral centra, while the Triassic Mastodonsaurus had the same parts completely ossified.
These were described by the late Professor Goldfuss under the generic name of Archegosaurus. The skulls, teeth, and the greater portions of the skeleton, nay, even a large part of the skin, of two of these reptiles have been faithfully preserved in the centre of spheroidal concretions of clay-ironstone. The largest of these, Archegosaurus Decheni, must have been three feet six inches long.
Now, however, it is considered probable that the soft back-boned Labyrinthodont Archegosaurus, was an immature or larval form, while Labyrinthodonts with completely developed vertebræ have been found to exist amongst the very earliest forms yet discovered.
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