On some of the Higher Crustacea from the British Coal-Measures

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Abstract
It is almost as satisfactory to clear up the history of a little-known or doubtful fossil as to discover one perfectly new. In the present case we have both pleasures combined; for the new and very perfect Macrurous Crustacean here for the first time given from the coal-measures illustrates and explains some published fragments, the real nature of which ought not to have been so long misunderstood. In Prestwich's great paper on the Coalbrook-dale Coal-field, read in 1836, and published some time after, a dubious Crustacean carapace, very imperfect in some respects, was introduced in the same plate with the Limuli . It is said, in the Explanation of the Plates, that “the only living form to which Dr. Milne-Edwards could refer it is the Apus cancriformis of the rivers of Central and Southern Europe.” It was called therefore Apus dubius . The figure is more imperfect than it need to have been; for the internal cast of the carapace only is figured, and Mr. Prestwich's collection contains the other half of the nodule, a gutta-percha cast from which shows the true external surface; and from this our figure 6 is drawn, only the other way upwards. The serrated border and the interrupted central ridge are very clearly shown in both specimens and figures.

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