1843.] 



267 



TABLE 11. 



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.] 



Crusincea. 

 Calymene Blumenbachii. 

 Dowriingiffi. 

 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. ^ 



Belleropbon carinatus. 

 globatus. 

 trilobatus. 

 n. s. 



Gasteropoda. 

 Turritella obsoleta. 

 conica. 

 Natica parva. 

 Trochus helicites. 



Conchifera. 



* Avicula (fragments). 



Nucula. 



CuciiUeea 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 three new species. 

 Spirifer ptychodes. 



interlineatus. 

 Atrypa a£5nis. 



two or three new species. 

 Leptasna lata. 



X euglypha. 

 depressa. 

 Orbicula rugata ? 



Radiata. 



Crinoidal remains abundant. 



* Actinoerinites (n. s. highly orna- 



mented. — Llangollen). 



PolypaHa. 



Stromatopora. 

 Fenestella. 



Cyathophyllum (several species). 

 Favosites (several species, one very 

 slender). 



* Graptolites ludensis. 



* Denotes the species characteristic of the Denbigh flagstone series. 



■}• 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. 



