232 PERMIAN FOSSILS. 



from a very perfect specimen belonging to Mr. Bowerbank, the counterpart of which 

 is in my own collection. It gives a better idea of the outline of the species than 

 Lord Enniskillen's specimen, as the latter has an unnatural prognathic character in 

 consequence of the crushing in of the frontal bones. Fig. 1 of PL XXVIII represents 

 a well characterised young individual of this species in the Collection of the Yorkshire 

 Philosophical Society. — P. G. E. 



" It will be seen, that I have merged Platysomus parvus into this species. M. 

 Agassiz founded it on the figures given by Mr. Winch in the ' Transactions of the 

 Geological Society,' and not on an examination of the originals : these (which are 

 in the Sunderland Museum) I have lately inspected, and I cannot find any difference 

 between them and an undoubted P. striatus in the Newcastle Museum. The 

 draughtsman of Mr. Winch's figures has not copied the originals so closely as could 

 be desired: he has, in consequence, incorrectly represented the dorsal and the ventral 

 fin of the same length, the posterior part of the body too rowid, the head too large, 

 and the root of the tail (which is injured in the originals) too slender ^^ 



Platysomus striatus occurs at Ferry-Hill (where the beautiful specimen figured and 

 belonging to Mr. J. S. Bowerbank was found), and Whitley, in Marl-slate. The so- 

 called Platysomus parvus was found in compact Magnesian limestone at Pallion Quarry. 



Family Sauroidei, Agassiz. 



Genus Pygopterus, Agassiz. 



Esox, Kriiger. 



PaLjEOTHBYSSUM, Blainville. 

 Nemopteuyx, Agassis. 

 Sauropsis „ 



Pygopterus mandibularis, Agassiz. Plate XXIII, fig. 1 a, h. 



Fossil fish not determined, Sedgwick. Trans. Geol. Soc. Lond., 2d series, vol. iii, 



p. 118, pi. X, figs. 1-3, 1829. 

 NEMOPTERyx mandibularis, s. Sauropsis Scoticus, Agassiz. Arc. Cat. 

 Pygopterus — Agassiz. Poiss. Foss., vol. ii, part ii, pp. 76-77, pi. liii, 



liii a. 

 (?) — scuLPTUs „ Poiss. Foss., vol. ii, p. 77. 



— Scoticus „ Bronn, Letliaea Geognostica, pi. ii, p. 128, 1835. 



— MANDIBULARIS „ Ann. Mag. Nat. Hist., vol. vii, p. 497, 1841. 



— — „ Morris, Catalogue, p. 204, 1843. 



— — „ Rep. 13th Meet. Brit, Assoc, p. 198, 1844. 

 (?) — SCULPTUS „ Loc. cit. 



^ King, Catalogue, p. 15. 



