Abstract
In a paper which I communicated to the Geological Society of London, Nov. 21, 1866, (“On some points in the structure of the Xiphosura, having reference to their relationship with the Eurypterida”) I have recorded all the then known genera both of Xiphosura and of Eurypterida, and in the tables which accompany the first part of my Monograph on the Merostomata, I have given both the genera and species with their range in time and space.

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