It is now twelve months since I had the pleasure to record, in the pages of this Journal, the discovery of Eophrynus Prestvicii, a new genus of Arachnides from the Coal-measures of Dudley. (See Geol. Mag., 1871, Vol. VIII., p. 385, Pl XI.) This remarkably perfect specimen is perhaps unequalled in the condition of its preservation by any Palæozoic fossil known. Although the fossil Arachnide, which forms the subject of this notice, cannot claim such distinction as Eophrynus, yet it is well deserving of being placed on record in the pages of this Magazine, as a new genus of airbreathers from the English Coal-measures.