A HISTORY OF LEICESTERSHIRE P. nitidus, which have been obtained from the so-called paper-shales of the Wigston Rhaetics, since this species is known only from that locality and Aust Cliff. The Leicestershire specimens have been described by Dr. Wood- ward in the paper already cited. The genus Pholidophorus is the typical representative of the family Pholidophoridae. The fish-remains from the Coal Measures of the county do not appear to be of any special importance, and have not yet been fully worked out. Teeth of the type of those of the imperfectly known cestraciont Sphenacanthus are recorded from Ashby de la Zouch coalfield by Mr. Browne, who also mentions other teeth from the same field referred to Pleuroplax attheyi and P. rankinei, members of a genus belonging to the family Cochliodontidae, a Palaeozoic forerunner of the Cestraciontidae. Another common Coal Measure cochliodont, Helodus simplex^ has likewise been recorded from the Ashby field, which has also yielded other teeth respectively assigned to two common representatives of the more ray-like Palaeozoic family Petalodontidae^ namely, Ctenoptycbius apicalis and Janassa linguae-formis (= Climaxodus, sp.). Among ganoid types, the common fringe-finned Goelacanthus lepturus has been stated to occur in the Leicestershire Coal Measures, where teeth of other widely- spread Carboniferous species, such as Megalicbthys hibberti, may very probably also have been found. 26
