The remains of a Palæoniscid fish from the Lower Carboniferous rocks of Flintshire, submitted to me by Mr. J. T. Stobbs, are unfortunately not sufficiently perfect to afford material for a complete diagnosis. The specimen shows the impressions of the outer surface of both mandibular rami and of the left maxilla, and beyond this we have only a mass of dislocated scales—the general form of the fish, the position of the fins, and the condition of the fin-rays being entirely lost.