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Updated: June 7, 2025
Thus the Devonian Ganoids, though almost all members of the same sub-order as Polypterus, and presenting numerous important resemblances to the existing genus, which possesses biconclave vertebrae, are, for the most part, wholly devoid of ossified vertebral centra.
Thus the Devonian Ganoids, though almost all members of the same sub-order as Polypterus, and presenting numerous important resemblances to the existing genus, which possesses biconcave vertebræ, are, for the most part, wholly devoid of ossified vertebral centra.
Boast a figurative term, taken from a braggadocio or boaster; it applies to any thing that is hollow or deceitful: for instance, when some potatoes that grow unusually large are cut in two, an empty space is found in the centra, and that potato is termed boast, or empty. He accordingly threw himself on the shakedown, and in a short time, as was evident by his snoring, fell into a profound sleep.
He learned, however, from Imhammed, one of the sheerefs, who had been an extensive traveller, a variety of particulars respecting the interior regions. The society had, at the same time, made very particular inquiries of Ben Ali, a Morocco caravan trader, who happened to be in London. From these two sources, Mr. Beaufoy was enabled to draw up a view of Centra.
K. Ch. He thinks that what belongs to the organism and to the soul has originated and developed up to man and his spiritual nature thus: that the creating centrum of the earth produces individual centra on its periphery, which tend more and more to bring into view the principle of centralization, in its contrast to the purely peripheral form of existence, until it reaches its goal in man, with his centralizing spirit.
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.
He rises very early, and when, at about six o'clock in the morning, his valet, Pio Centra, enters his little bedroom, he more often finds the Pope risen than asleep. He is accustomed to sleep little not more than four or five hours at night, though he rests a short time after dinner.
Thus the Devonian Ganoids, though almost all members of the same sub-order as 'Polypterus', and presenting numerous important resemblances to the existing genus, which possesses biconcave vertebrae, are, for the most part, wholly devoid of ossified vertebral centra.
The late able ichthyologist Heckel pointed out the fact, that, while the Pycnodonts never possess true vertebral centra, they differ in the degree of expansion and extension of the ends of the bony arches of the vertebrae upon the sheath of the notochord; the Carboniferous forms exhibiting hardly any such expansion, while the Mesozoic genera present a greater and greater development, until, in the Tertiary forms, the expanded ends become suturally united so as to form a sort of false vertebra.
Among Reptiles, the highest living group, that of the Crocodilia, is represented, at the early part of the Mesozoic epoch, by species identical in the essential characters of their organisation with those now living, and differing from the latter only in such matters as the form of the articular facets of the vertebral centra, in the extent to which the nasal passages are separated from the cavity of the mouth by bone, and in the proportions of the limbs.
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