lxxviii 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. 



disappeared, to be again created in the Tertiary and existing epochs. 

 I must again maintain that it is more natural to conceive that the 

 link of connexion between the dead and the living has been kept up, 

 although hitherto the region of their habitation, during the long period 

 of time elapsed, has been veiled from observation. 



I shall not attempt further to follow the able author of no less than 

 fifty distinct treatises, some of vast magnitude and interest, and all 

 full of ingenuity and knowledge ; but I may notice him as the author 

 of that nomenclature which is gaining ground rapidly ; and in doing 

 so I will quote, as illustrative of his method, the distribution of the 

 Bryozoa-Cellulina, which he thus details : — 



Terrains 

 Cretaces. 



< 



Terrains 

 Tertiaires. 



Existing 

 Fauna. 



f"Etage Neocomien 



— Aptien . . 



- Albien . . 



- Cenomanien 



- Turonien 



- Senonien 



'Stage Suessonien 



— Parisien . . 



— Ealunien 



— Subapennin 



v. 



} 



Genera. 

 1 

 1 

 1 

 11 

 9 

 54 



3 

 12 



40 

 4 



58 



V593 species. 



Species. 



1 



1 



1 



26 



17 



547 



5 



75 ,> 109 

 312.. 312 



The Bryozoa-Centrifugina, which form the other division of the 

 class, he discovered in almost all the geological formations, and he 

 gives their numbers thus : — 



Genera. Species. 



In the Palaeozoic 10 66 



Triassic 



Jurassic 32 93 



Cretaceous 130 480 



Tertiary 32 101 



Existing epoch 26 80 



And he concludes from the whole that there were three centres of de- 

 velopment of the Bryozoa, the first two composed of B.-Centrifugina 

 alone, — namely, one in the Carboniferous stage of the Palaeozoic, and 

 one in the Bathonian of the Jurassic, — and the other composed of 

 both orders, Cellulina and Centrifugina, in the Senonian stage of the 

 Cretaceous. 



Having now, I trust, enabled every one to form a correct judgment 

 of the great and varied abilities of M. D'Orbigny, in aid of whose 

 researches the Society has twice awarded the proceeds of the Wollas- 

 ton Eund, I will close my remarks with the following passage from 

 the report of MM. Brongniart, Dufrenoy, and Elie de Beaumont, on 

 his " Geology of South America," as it conveys a sentiment in which 

 all our members will, I am sure, cordially concur : — 



