G. L. Elks 8f E. If. R. Wood— On the Dry gill Shales. 247 



and differ markedly from that belonging to the beds exposed in the 

 lowest part of the same. The following is a complete list of tlie 

 fossils as yet identified from the Dry gill Shales, with their ranges. 

 Matiy of the specimens have evidently been much affected by the 

 mechanical deformation to which the rocks have been subjected ; 

 scarcely any of them are complete and many are very obscure. 



Tbilobita. 

 Name. Eemabks. Eange. 



*Ampyx rostratus (Sars.) . . . Common Llandeilo — Bala. 



Ampyx tetragonus (Angelin) Bala (Trinucleus ScMefer of 



Sweden) . 



Ampyx fioiiidus (Forbes) Eala. 



*Stiji/iiia 2Iurchlsoince (Murcli.) . . Common Llandeilo — Bala. 



Trinucleus seticornis (Hisinger) . . Common Bala. 



Trinucleus concentricus (Eaton) . Common Bala — Upper Llandovery (?) 



Trinucleus, s^. {aWieA. io nffinis) Bala (Trinucleus Schiefer). 



Fhacops [Fiery gonietopus) alifrons ? 



(Salt.) Bala. 



Fhacops (Acaste) appendiculatus .... 



(Salt.) Bala. 



Fhacops, sp. 



Dindymene ornata (Linn.) Bala (Trinucleus Schiefer). 



Calymene Blumenbachii (Brong.) Tremadoc — Aymestry (?) 



Calymene senaria (Conrad) Llandeilo — Wenlock. 



*Calymene cambrensis (Salt.) Llandeilo — Bala. 



*Lichas laciniatus (Dalm.) Bala (Brachiopod Schiefer). 



OSTRACODA. 



*Beyrichia compUcata (Salt.) Llandeilo — Bala. 



Brachiopoda. 

 *Oholella? 



*Flectamhonites sericea (Sow.) ....... Llandeilo — Wenlock Shale. 



Flectambonites tr ansversalis (Wahl.) .... Bala — Aymestry. 



Fleetambonites quinquecostata 



(M'Coy) Llandeilo — Upper Llandovery. 



*Orthis testudinaria (Dalm.) . . Very common Llandeilo — Upper Llandovery. 



Orthis elegantula (Dalm.) Llandeilo — Upper Ludlow. 



Lingula ovata (M'Coy) Llandeilo — Bala. 



Lamellibkanchiata. 



Ctenodonta varicosa (Salt.) . . . Common Bala. 

 Ctenodonta levata (Hall) Bala. 



Ctenodonta, sp. ? 

 Orthonota, sp. ? 

 Modiolopsis ? 



Gasteropoda. 

 Murchisonia, sp. 



Fleurotomaria turrita (Portl.) Bala. 



Fleurotomaria, sp. 

 Bellerophon? 



Cephalopoda. 

 Orthoceras, sp. 



* Denotes species previously recorded by Nicholson and Marr. 

 The fossils recorded above are by no means uniformly distributed 



