I
regard
the Crustacean which I am about to describe with peculiar interest, on account of its belonging to that group of the
Brachyura
which comprehends the highest forms of the class, and of which hitherto but one species (
Mithracia libinoides
, Bell*) has been described as occurring in the fossil state in Great Britain.
At present I am only aware of the existence of two specimens of the species which I shall here describe,—one in the collection at the British Museum, the other in that of the Geological Survey of Great Britain; both are from the Lower Greensand of Atherfield in the Isle of Wight, and in each the carapace only is preserved. It is from an examination of these specimens that I have taken the following characters.
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