654 



PEOCEEDINGS OP THE GEOLOGICAL SOCIETY. 



taneous deposition, which, took place in one general sea, over one 

 definite, once connected, but now disunited area. 



Having compared the Devonian species generally amongst them- 

 selves, in their respective areas in North and South Devon, and 

 with those of the Ehenish, Belgian, and French areas, and partly 

 with the Carboniferous, it now remains for me to analyze the par- 

 ticular groups of organic remains amongst themselves, in our North 

 Devon district, and also to compare the species in that area with 

 those of Ireland and the Continent : in no other way can we arrive 

 at the relation which I believe exists amongst the fossil remains, and 

 at the value of the term " Devonian " or " the Devonian System." 



I propose, therefore, to examine and compare the British Devo- 

 nian Coelenterata, Brachiopoda, and Cephalopoda amongst them- 

 selves, these groups being of chief value, — also their relation to the 

 continental species of the same age, and to the Carboniferous of 

 Devon, Ireland, and Britain generally. 



Table YII. — Comparison of the British Devonian Coelenterata with 

 those of the Rhine, Belgium, and France. 





British. 



Foreign. 



11 



as 





.§ 



_2 



1 



Acervularia pentagona, Goldf. 



Goldfussii, I)e Vern 



Eoemeri, i)g Vern 



Alveolites suborbicularis, Lam 



Amplexus tortuosus, Phill 



Cyathophyllum csespitosum, Goldf. 



Boloniense, Blainv 



ceratites, Goldf. 



helianthoides, Goldf. 



hexagonum, Goldf 



Eoemeri, M.-Edw 



turbinatum? 6^c»^c?/. 



Cystiphyllum vesiculosum, Goldf . . . 

 Favosites Goldfussii, -D' Or5 



* 



* 

 ^ 



^ 

 * 



•J5- 

 a- 





L. 



M 



■H- 

 •«■ 



■Sf- 

 Mr 



U. 



L. 



M. 



■K- 

 if 



■Sf 

 •5f 



it 



u. 



■Sf 



L. 



M. 



•5f 



■St 

 •5<- 



U. 



it 



dubia, Blainv 



fibrosa? Goldf 



... 



■«• 



it 



^ 





reticulata, Blainv 



Fistulipora cribrosa, Goldf 



Heliolites porosa, Goldf 



Petraia Celtica, Lonsd, 



Pleurodictyum problematieum, Gldf 



^ 





Coelenterata (Corals).— There are 24 genera and 51 species of Corals 

 known in the Devonian rocks of North and South Devon (vide Tables 

 II. and Y.); and there appear to be 2 forms, Fistulipora (Manon) cri- 

 hrosa,(joldf.,andMichelinia antiqua, M'Coy, on the confines of the two 



