THE 



QTJARTEELY JOURNAL 



OF 



THE GEOLOGICAL SOCIETY OF LONDON, 



PROCEEDINGS 



OF 



THE GEOLOGICAL SOCIETY. 



April 18, 1849. 



The following communications were read : — 



1. Palichthyologic Notes. No. 3. — Oii the Ganoidei Hetero- 

 CERCi. By Sir Philip de Malpas Grey Egerton, Bart., 

 M.P., F.R.S. 



This family has been considerably reduced, since the publication of 

 the * Poissons Fossiles,' by the new arrangement of the fishes of the 

 old red sandstone and their allies contained in the ^ Monographic des 

 Poissons du Vieux Gres Rouge ' of M. Agassiz. A further reduction 

 became recently necessary in consequence of the discovery of the true 

 affinities of the genus Platysomus'^ . As at present constituted, the 

 genus Amblypterus stands at the head of the family. 



Genus Amblypterus, Ag. 



Of this genus Agassiz has described nine species, but one of these 

 he subsequently cancels, namely Amblypterus OJfersi from Brazil, 

 which forms the type of his new genus Rhacolepisf, Since the 

 publication of Agassiz' work. Professor Goldfuss has described in 

 great detail the characters of the scales of Amblypterus macropterusX, 

 which rarely occur in a good state of preservation. He enumerates 



* Palichthyologic Notes, No. 2. p. 329. f Poiss. Foss. vol. ii. part 2. p. 283. 

 X Beitrjige zur vorweltlichen Fauna des Steinkohlengebiiges, p. 20, 

 VOL. VI. PART I. B 



