On some Species of Eurypterus and Allied Forms

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Abstract
S ince the appearance in 1859 of the memoir by Prof. Huxley and myself on Pterygotus and its allies, the great work of Prof. Hall, of Albany, has appeared (‘Palæontology of NewYork,’ vol.iii.), containing the fullest material for the illustration of this genus; and following, as it did, upon the very full account given by Dr. Wieskowski, it has completed our knowledge of the structure of this remarkable genus. And there seems to be now no doubt whatever that the anomalous plates and processes about the position of which Prof. Huxley and myself were compelled to guess, and which for many obvious reasons were compared with the under portion of the head, really belong to the under part of the thorax. All this was as satisfactorily made out by the Russian author as by Prof. Hall's independent researches. We had also arrived at the same conclusion before Wieskowski's admirable paper reached us. For previous to the Meeting of the British Association at Aberdeen in 1859, I was sent by the Director-General of the Geological Survey to examine the collections made by Mr. Slimon, of Lesmahago; and in that fine series (which was sent to the Meeting for exhibition) we found abundant proofs of the true position of the sternal plates, such as Wieskowski and Hall have figured, and of the place of the post-oral plate, previously assigned by Prof. Huxley to the hinder margin of the mouth. The position of the chelæ in these new specimens also confirmed the Professor's judgment

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