Murchisons Silurian System. 



221 



Atrypa tenuistriata, 



« aspera, 



Terebratula imbricata, 



Cuneata, 



Nerita haliotis, 

 Orthoceras Brightii, 



Trilobites.* 

 Asaphus caudatus, l Common to the Ludlow 



Calymene Blumenbachii, J and Wen lock beds. 

 Calymene variolar is, Parkin 



macrophthalma, Brong. 



— — — Downingicc, 



— tuherculata, Peculiar to the 



Asaphus Stokesi, Murch. J> Wen lock forma- 



tion. 



— — — longicaudatus, id. 



Bumastus Bariensis, id. 



Paradoxides bimucronatus, id. 



— — - quidrimacronatus, id. 

 The shale of the Wenlock formation is also distin- 

 guished by 



Productus transversalis. 



Spirifer cordiospermiformis, 



trapezoidalis, 



Terebratula brevirostra, 



— interplicata, 



imbricata, 



Orthoceros attenuata, 

 The following are common to all the Silurian rocks :— 

 Atrypa affinis.f 

 Productus depressus, var. pi. 12, fig. 2. 



* Examples of these fossils shall be figured in future numbers when 

 we arrive at that portion of the work in which they are described in 

 detail by W. S. MacLeay, Esq., they are of the more interest, as none 

 have as yet been discovered in India. 



t Terebratula affinis, Sow. Min. Con. 



