THE GEOLOGICAL AGE OF CENTRAL AND WEST CORNWALL. 



27 



Sclerodus pustuliferus ? 

 Sphagodus pristodontus 

 Cheiracanthus ? 

 Scaphaspis ? 

 Phyllolepis 



{not H. nobil, according to Murchison ; perhaps Bothriolepis of Egerton). 

 Onchus Murchisonii Polperro. Peach 1844. 



{not 0. Murch. according to Murchison, may be Ctenacantbus or perhaps O. 

 tenuirostris of Egerton.) 



Polruan. Couch 1850. 



Polperro, &c. Peach 1844. 



do. Peach 1847. 



Lantivet Bay. Eay-Lankester 18G9. 



do. do. 



The general fseces of tlie greatly damaged fauna of the " Fowey 

 Beds," induced Sir Eoderick Murchison* to speak of the rocks of 

 this part of Cornwall as Upper Silurian. In arriving at this 

 conclusion he especially took into account the fish-remains. f 

 Since then the question has often heen raised, but very little new 



* See his letter to Sir Charles Lemon {Trans. Boy. Geol. Soc. Corn., 1846,) and 

 his address as Presidentof the Geological Section of the British Association, (1847) . 



f " The fish-remains of Cornwall appear to belong to the Upper Silurian " Rep. 

 Brit. Assoc. Cork, 1847. 



