226 PERMIAN FOSSILS. 
PALMONISCUS MACROPTHALMUS, Agassiz. Rep. 13th Meet. Brit. Assoc., p. 198, 1844. 
= — Re De Verneuil, Bull. Soc. Géol. de France, 2™° 
série, vol. i, p. 38, 1844. 
— — Geol. Russ., vol. i, p. 227, 1845. 
— — Tennant, Strat. List, p. 89, 1847. 
— — King, Catalogue, p. 14, 1848. 
— — Howse, Trans. T. N. Ff. C., vol.i, p. 234, 1848. 
— _ ise 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 liberality 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. glaphyrus.—P. G. K. 
Palaoniscus macropthalmus occurs at East Thickley, Midderidge, and Thrislington 
Gap, in Marl-slate. According to Dr. Geinitz, it occurs in the Kupferschiefer of 
Riechelsdorf. 
PALEONISCUS CATOPTERUS, Agassiz. 
PALAONISCUS CATOPTERUS, Agassiz. Proceedings of the Geol. Soc., vol. ii, p. 206, 1835. 
— —= a 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. Géol. de France, 2™° série, 
vol. i, p. 39, 1844. 
= — a Geol. Russ., vol. i, p. 227, 1845. 
= — a Quart. Journ. Geol. Soc., p. 4, 1849. 
M. Agassiz has placed Palgoniscus 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 Palgoniscus 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 Palgonisci: the eye is placed forward; the mouth appears small; the 
operculum is nearly semicircular. The dorso-ventral series of scales are very regular 
