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For a closer description of my family of Lepidostei, to which belong all the ante-chalk bony fishes, I am anxious to have for dissection a Polypterus Bichir and a Lepidosteus osseus, or any other species belonging exclusively to the present creation. Hitherto, I have only been able to examine and describe the skeleton and external parts.
I have also begun to study your text, so rich in well arranged facts; the monograph of the Lepidostei, the passage upon the bony rays, and, dear Agassiz, I could hardly believe my eyes, sixty-five continuous pages of the third volume, without interruption! You will spoil the public. But, my good friend, you have already information upon a thousand species; "claudite jam rivos!"
They were of the Labyrinthodont family, and their association with the fish of the coal, of which so large a proportion are ganoids, reminds us that the living perennibranchiate amphibia of America frequent the same rivers as the ganoid Lepidostei or bony pikes. Slab of sandstone from the coal-measures of Pennsylvania, with footprints of air-breathing reptile and casts of cracks.
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