386 On the Fossil Fishes of the Carboniferous Inmestone Series of Great Britain. 
cone are, compared with P. dentatus, very weak, had they not been present the 
tooth would have been a very exact representative of some species of Cladodus. It 
is retained in its present position with grave doubts as to its generic identity. 
Formation and locality : Lower Carboniferous schists of Kettlewell and Kendal. 
Ex, coll. Woodwardian Museum, Cambridge. 
Genus.—Glyphanodus, Davis. 
Teeth, consisting of a single pointed, conical, excessively thin, crown, cutting edge 
sharp, trenchant. Summit of crown inclined forwards. Surface ornamented by semi- 
radiating strize, Base extending parallel with coronal surface, deep, coarsely osseous, 
thin, equal in breadth to that of the tooth. 
Glyphanodus tenuis, Davis. 
(Pl. XLIX., figs. 24, 25.) 
Teeth, medium size, triangular, very thin. Crown consists of a single, 
conical, thin and laterally expanded surface, 1:0 inch wide at the base, and ‘7 of an 
inch in height to the summit of the cone, gradually tapers to an accuminate apex. 
Anterior surface convex, corespondingly concave posteriorly. Marked by a large 
number of semi-longitudinal strize : indistinct or absent towards the base. ‘The striz 
radiate to some extent from the centre of the tooth towards the lateral margins. 
The ridges are bold, separated by their own diameter from each other. Cutting 
edge sharp and smooth. 
‘These teeth are peculiarly thin and slender. The base possesses more of the 
characters of the Petalodonts, extending downwards in a line with the surface of the 
crown rather than with the Cladodonts whose base extends backwards at right angles 
to the crown. ‘The pointed surface of the crown, on the other hand, is more clearly 
related tothe Cladodontsand especially with the modification found in Pristicladodus, 
trom which however it is separated not only by the form of the root, but also by 
the absence of denticulations, on the lateral surface of the crown. | 
Formation and locality : Carboniferous Limestone, Upper Wensleydale. 
Ex. coll. Wm. Horne, Esq., and Reed collection, Museum, York 
Family.—Orodontide, L. G. de Koninck. 
Ref. “ Fauna du Calcaire Carb. de la Belgique,” p. 29, 1878. 
Prof. Agassiz, in the “ Recherches sur les Poissons Fossiles,” pointed out and 
insisted on the intimate relationship existing between the still surviving Cestracions 
of the Australian and Chinese seas and the fossil genus Orodus of the Carboniferous 
series. M. de Koninck (“Fauna du Calcaire Carbonifére de la Belgique”) united 
