Further Notes on Eocene Crustacea from Portsmouth

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Abstract
On December 21st, 1870, I laid before this Society descriptions of three new forms of Crustacea, obtained by Messrs. C. J. A. Meyer and Caleb Evans, during the progress of the “Dockyard Extension Works” at Portsmouth, from strata of Lower Eocene age. Since that date, these ardent collectors have pursued their studies of the beds exposed, and continued to secure all the fossils within their reach. Through their kindness I have from time to time been enabled to examine and study the additions made to the Crustacea from this rich locality, and I now beg leave to submit my further notes upon them to the Society. On the first form (named by me, in my former paper, Palæocorystes glabra ) I have no additional materials to present; but of the genus Rhachiosoma (represented at first by only two imperfectly preserved specimens, named respectively R. bispinosa , and R. echinata ) there are now nine examples known. The accession of these very perfect specimens, necessitates the redescription of R. bispinosa , for which there are now ample materials. Four other specimens, representing two new Eocene forms, about to be described, and a large Thenops , near to T. scyllariformis , complete the series. Four other specimens, representing two new Eocene forms, about to be described, and a large Thenops , near to T. scyllariformis , complete the series. Rhachiosoma Bispinosa , H. Woodw., 1870, Quart. Journ. Geol. Soc 1871, vol. xxvii, pl. iv. fig. 3, p. 91. Pl. I. Although originally supposed to be the smaller form, the discovery of

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