BTHERIDGE DETOXIAN EOCKS AND FOSSILS. 



above mentioned, in which it is seen that 52 (or more, than 50 per 

 cent.) are common to the British and European Devonian rocks. 

 Again, if we admit that the Barnstaple beds are of Carboniferous 

 age, and take the whole of the North-Devon Brachiopoda, or com- 

 pare those of the same area together (i.e. the north and south side 

 of the supposed fault) and with those of any Carboniferous locahty, 

 the result is, that of the 48 species known in the Xorth Devon Devo- 

 nian series, thirteen are also Carboniferous, all of which are in the 

 Upper division south of, or above, the red Pickwell sandstones, 5 

 occurring in the Middle division ranging north of Pickwell, and one 

 (Chonetes Hardrensis or C. sordida) in the Lower or Lynton group ; 

 in fact, the relations and affinities of nearly the whole of the Devo- 

 nian fossil fauna are through those species that comprise the Upper 

 Devonian group south of and upon the Upper Old Eed Sandstone of 

 the line above mentioned. (See Tables YIIL, IX., and X.) 



Table IX. — Sjyecies occurring in the Lower, Middle, ami Upper 

 Devonian Series of North Devon and Petheinjuin (in North Cornivall), 

 showing those species that pass into the Carboniferous in any area. 



Species. 



Xorth. Devon. 



Pether- 

 win. 



i 



1 



J 

 o 



1 

 1 



.1 

 § 



1 



o 



1 



i 



1 

 1 



1 



1 



a. 



Knorria dichotoma, Hovghton 



•^ 



* 





* 



Adiautites Hibernicus, Forbes 



1 





IBornia (Knorria) transitionis, Gijpp 



1 



4t 



Stromatopora concentrica, Goldf. 





■X- 



* 

 * 



* 

 * 



Alveolites suboi'biciilaris, Lam 



* 



Amplexus tortuosus, Phill 



Cyatliophyllum rcquisontum, M.-Edw 





Boloniense, Blair v 





ca^spitosum, GoJclf. 





heliautboides, Goldf. 





obtortuni, M.-Edw 





Cystipbvllum resiculosum, Goldf. 





Favosites cervicornis, Blainv 



* 



dubia, Blainv 



fibrosa?, 6^o/<7/. 





Fistulipora cribrosa, Goldf 





Hallia Pengellii, ilZ-Zf/M' 





■X- 



Heliolites porosus. Goldf. 





HeliopbyUum Hallii, M. -Edw 





Michelinia antiqua, M'Coy 





Petraia celtica, Lonsd 



it 



C'.'.'. 



* 



pleimradialis ?, rhill 



Aetinocriuus tennustriatus, Phill. 



triacontadaetylus, Mill. 



Adelocrinus hystrix, Fhill 







Cjathocrinus clistans, F/i ill 



i 



eilipticus, Phill. 



'.'..... 



i 



