2,22 PERMIAN FOSSILS. 



The specimen alluded to, the only one that has been procured, was found in the 

 Lower New Red Sandstone near Westoe, by Mr. William Hutton, to whose unceasing 

 labours, as Honorary Secretary, the high standing of the Newcastle Museum is to be 

 chiefly attributed. 



Genus Gyropristis, Agassiz. 



Gyropristis obliquus, Agassiz. 



Gyropristis obliquus, Agassiz. Poiss. Foss., vol. iii, p. 177. 



— — „ Report ISth Meeting Brit. Assoc, p. 198, 1844. 



— — „ De Verneuil, Bull. Soc. G^ol. de France, 2'"" serie, vol. i, 



p. 38, 1844. 



— — „ Geol. Russ., vol. i, p. 226, 1845. 



This Ichthyodoruhte is stated to be from the Magnesian Limestone near Belfast ; 

 but it is doubtful whether the rock in which it was found belongs to the Permian, 

 or to the Triassic system. 



Order Goniolepidoti, Agassiz. 



Family Lepidostei, Agassiz. 



Genus Palceoniscus, Agassiz. 



Clupea, Blainville. 

 Pal^othkissum, Blainville. 

 Pal^^oniscum, Agassiz, 1833. 



The occurrence of fishes, belonging to this genus, in the Permian Marl Slate of 

 England, was first made known by the Memoir of Professor Sedgwick, published in the 

 ' Transactions of the Geological Society of London,' 2d series, vol. iii, p. 37. M. de 

 Blainville, to whom the original specimens were submitted, recognised their affinity to 

 the fishes from the Kupfer-schiefer, arranged by him under the genus Palaothrisswn, 

 and considered two species as identical with those found in this formation. The 

 more extensive researches of Professor Agassiz in this department of palaeontology 

 enabled him, on his visit to England in 1834, to detect discrepancies which had 

 escaped M, de Blainville's observation, and consequently to establish no less than five 

 new species of this genus from the Marl Slate of the North of England. The 

 descriptions of these species, published in the ' Poissons Fossiles,' are so copious and so 

 accurate, that the reader is referred to that work for the details of the specific 

 characters. — P. G. E.i 



^ The passages bearing these initials are contributed by Sir Philip Grey Egei-tou. 



