BRITISH DEVO]\IAN BRACHIOPODA. 



11 



Upper Devonian 



■Psammites de Condros 



•Schistes de Famenne 



Middle Devonian Calcaire de Givet 



Lower Devonian 



{ Calcaires d'Etroeungt. 



C Psammites. 



^Schistes de Famenne proprement dits. 



\ Schistes a Cardium palmatmn. 



1 Calcaire (de Trelon). 



^Couches a Terehratula cuhoides. 



(divided into nine layers). 

 f Schistes a Spirifera speciosa. 

 Schistes a Calceoles j Calcaire d'Ohiim et de Glageon. 



^ Schistes a Spirifera cultrijugata . 

 Poudingue de Buinot, 

 /'Grauwacke a Leptana C Schistes,. 

 \ MurcUsoni \ Gres d'Aror. 



] Conchos de Gedinne i Schistes bigarres a Grammysia. 



Conglomerats et Schistes ( Poudingue. 



During several years, in conjunction with Mr, Bouchard, I studied and collected the 

 Devonian Brachiopoda from the Upper-Devonian beds of Perques, near Boulogne. The 

 study was subsequently continued by Mr. E, Rigaux, who published two valuable papers 

 upon the subject.^ Out of some forty species known to occur in the locality about 

 fifteen have been found in our Devonian rocks, viz. : 



Athyris concentrica. 

 Spirifera Verneuilii. 



— Urei. 



— undifera. 

 Cyrtina Jieteroclita. 



— Demarlii. 

 Alrypa reticularis. 



— aspera. 



Bhyn. Lummatonensis. 

 Pentamerus hrevirostris. 

 Orthis striatula. 

 — Eifliensis. 

 Streptorhynchus umhraculum . 

 Strophalosia productoides. 

 Produdus subaculeatus. 



Nearly all occur likewise in the Middle-Devonian beds at Lummaton or Hope's Nose. 

 Por many valuable references to the subject-matter of this Monograph, see also the 

 " List of Works on the Geology and Palaeontology of Devonshire and Cornwall," by Mr. 

 W. Whitaker, in the ' Transactions of the Devonshire Association for the Advancement 

 of Science, Literature, and Art,' 1870 — 1872, also the 'Journal of the Royal Institution 

 of Cornwall,' No. xvi, 1875. The volumes of the ' Geological Record' contain many 

 useful additions to those above named. 



^ ' Description de quelques Brachiopodes du terrain Devonien de Terques,' Boulogne, 5th Nov., 1872 ; 

 and 'Geol. Mag.,' vol. v, Oct. 1878. 



