Rev. J. J. Conybeare on Shells in Slate. 425 



found elsewhere in Cornwall : we searched in vain for the octohe- 

 dral ore of titanium (anatase) which from the character of the 

 slate, and its accompanying minerals, we thought ourselves not 

 unlikely to discover. The rock has not heen ascertained as yet to 

 contain any metalliferous veins : we observed one minute bunch of 

 yellow copper ore imbedded in the slate itself. The strata are at 

 this spot much freer from curvatures and other contorsions than 

 they are along the coast to the eastward of it. 



The slate of Snowdon bears the impression of shells resembling 

 those contained in the present specimen. At Tintagel they are 

 certainly of very rare occurrence : though we spent some hours in 

 the quarry, we could not find any further traces of them. 



Figures of the shells from Tintagel will be found at Plate 25. f. 1. 

 The lower figure represents a specimen of fossil shells from Snow- 

 don, presented to the Geological Society by the Woodwardian 

 Professor. 



