226 PERMIAN FOSSILS. 



Pal^oniscus macropthalmus, Jgassiz. Rep. 13th Meet. Brit. Assoc, p. 198, 1844. 



— — „ De Verneuil, Bull. Soc. Geol. de France, 2^' 



serie, vol. i, p. 38, 1844. 



— — „ Geol. Russ., vol. i, p. 227, 184.5. 



— — „ Tennant, Strat. List, p. 89, 1847. 



— — ,, King, Catalogue, p. 14, 1848. 



— — „ Howse, Trans. T. N. F. C, vol. i, p. 234, 1848. 



— — ,, Geinitz, Versteinerungen, p. 5, 1848. 



The representation given of this fish is taken from the original drawing of Mr. 

 Dinkel, made for the ' Poissons Fossiles,' and now, through the hberahty of the Earl 

 of Ellesmere, deposited in the library of the Geological Society of London. The 

 species is distinguished by the large size of the head, the slender proportions of the 

 body, and the small dimensions of the scales, being in all these particulars diametri- 

 cally opposed to the characters of P. glaphyms. — P. G. E. 



Palaoniscus macropthalmus occurs at East Thickley, Midderidge, and Thrislington 

 Gap, in Marl-slate. According to Dr. Geinitz, it occurs in the Kupferschiefer of 

 Riechelsdorf. 



Pal^oniscus catopterus, Agassiz. 



Paljloniscus catopterus, Agassiz. Proceedings of the Geol. Soc, vol. ii, p. 206, 1835. 



— — „ Portlock, Ordnance Surv., Londonderry, App., 



vol. i, 1837. 



— — „ Poissons Fossiles, vol. ii. 



— — ,, Portlock, Geol. Londonderry, p. 468, 1843. 



— — „ Morris, Catalogue, p. 200, 1843. 



— ~ ,, Report, 13th Meet. Brit. Assoc, p. 199, 1843. 



— — „ De Verneuil, Bull. Soc. Geol. de France, 2""° s^rie, 



vol. i, p. 39, 1844. 



— — „ Geol. Russ., vol. i, p. 227, 1845. 



— — „ Quart. Journ. Geol. Soc, p. 4, 1849. 



M. Agassiz has placed Palaoniscus catopterus in the Triassic system ; while Sir 

 Roderick I. Murchison and M. de Verneuil have stationed it in the Permian. It is, 

 therefore, noticed in the present work as doubtful in regard to its geological age. 



Sir Philip Grey Egerton has lately described this species in a memoir read 

 before the Geological Society of London in the following terms : — '' Although 

 the discovery of this species in the new red sandstone of the County Tyrone 

 was communicated to the Geological Society by Sir Roderick Murchison so long 

 ago as 1835, yet no description of the fish has yet been published. It was 

 assigned to the genus Palaoniscus by Agassiz, who very happily noted its most 

 distinctive character in the specific appellation catopterus. In size it is the smallest, 

 in form the most slender species of the genus. The head is small and more pointed 

 than in other Palaonisci : the eye is placed forward ; the mouth appears small ; the 

 operculum is nearly semicircular. The dorso-ventral series of scales are very regular 



