II. On the structure and development of the skull in sturgeons ( Acipenser ruthenus and A. sturio )

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Abstract
Since the publication of my paper on the skull of the salmon, a Teleostean fish, I have made many efforts to obtain early stages of the Ganoid types. Until the last two years, however, I have failed. At last, I have been taken almost by surprise by the kindness of Professor W. Salensky, of Kasan, and of Professor Alexander Agassiz, of Harvard College, Cambridge, Mass. The former has supplied Mr. F. M. Balfour and myself with a number of bottles of early stages of the sterlet ( Acipenser ruthenus ), whilst from Professor Agassiz we have received fifty-four bottles of fecundated eggs and embryos of various stages of the Lepidosteus .

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