SEDGWICK ON NORTH WALES. 



21 



TABLE II. 



Fossils of the Denbigh Flagstone and Sandstone Series, found in 

 various Parts of North Wales. 



[Drawn up by Messrs. J. W. Salter and J. de Carle Sowerbt.] 



Crustacea. 

 Calymene Blumenbachii. 

 Downingia?. 

 one or two new species. 

 Asaphus caudatus. 



longicaudatus. 



Cawdori. 



(subcaudatus). 



Annelida. 

 Serpulites longissimus. 



Cephalopoda. 



Lituites Ibex. 

 Orthoceras striatum. 



articulatum. 



virgatum. 



annulatum. 



* Creseis tenuef (Vahl). 



(primaeva). 



*a conical species. 



Heteropoda. 



Bellerophon carinatus. 

 globatus. 

 trilobatus. 

 n. s. 



Gasteropoda 



Turritella obsoleta. 



conica. 

 Natica parva. 

 Trochus helicites. 



Conchifera. 



* Avicula (fragments). 

 Nucula. 



Cucullasa antiqua. 



a large n. s. 



* Cardiola interrupta. 



* Cardium? 



Cypricardia (several imperfect). 



Brachiopoda. 



Terebratula navicula. 



t semisulcata. 

 (lacunosa. Sil. Sys. p. 5.) 

 Nucula. 

 Wilsoni. 

 bidentata. 

 Orthis lunata. 



orbicularis. 



two or tbree new species. 

 Spirifer ptychodes. 



interlineatus. 

 Atrypa affinis. 



two or three new species. 

 Leptaena lata. 



X euglypha. 

 depressa. 

 Orbicula rugata? 



Radiata. 



Crinoidal remains abundant. 



* Actinocrinites (n. s. highly orna- 



mented. — Llangollen). 



Polyparia. 



Stromatopora. 

 Fenestella. 



Cyathophyllum (several species). 

 Favosites (several species, one very 

 slender). 



* Graptolites ludensis. 



* Denotes the species characteristic of the Denbigh flagstone series. 



-J- Names substituted for those given in the Silurian system, in consequence 

 of the examination of a collection from Sweden, in the possession of Mr. Mur- 

 chison. 



\ Denotes the species which have hitherto been found only in the more cal- 

 careous beds at Plas- Madoc, Llanrwst. 



c 3 



