50 MONOGRAPH OF DURA DEN. 



CHAPTER IV. 



DESCRIPTION OP THE FOSSIL REMAINS. 



The generic and specific descriptions of several of this 

 remarkable group of fossils are already well known to geo- 

 logists by the works of M. Agassiz, the Poissons Fossiles and 

 the Monographie du Yieux Gres Rouge, and which we mainly 

 adopt in the following abridgment of his more elaborate 

 details. The contributions of my distinguished friend Pro- 

 fessor Huxley now for the first time enrich the science of 

 Palaeontology, and cannot fail to be deeply interesting, espe- 

 cially in the new views advanced on the affinities of the genus 

 Eoloptychius. His descriptions of the new genus Phanero- 

 pleuron show the importance to all fossil collectors of carefully 

 preserving every organic fragment, however small, they may 

 casually obtain, — the several portions of this beautiful repre- 

 sentation having been procured by me at the intervals of 

 many years — some twenty years ago, some ten, the last within 

 the present year, furnishing the large development of the 

 caudal and dorsal fins — and now out of all, in the hands of the 

 scientific artificer, the perfected model of this unknown crea- 

 ture of the rocks. Agassiz first named this fish Glypticus 

 simply, but, from the fuller and more perfect specimens lately 

 submitted to him, he agrees to the more descriptive appella- 

 tion now assigned by Professor Huxley. 



The Plates VII. and VIII., from the beautiful drawings of 

 Lady Kinnaird, show the figures of the fishes as they lie in the 



