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SUPPLEMENT TO THE CRAG MOLLUSCA. 



Pinna tectinata? Linn. Crag Moll., vol. ii, p. 50, Tab. VIII, fig. 11. 



Localities. Cor. Crag, Ramsholt and Sutton. Lower Glacial, Cromer Cliff? 



The specimen figured as above referred to was found by myself in the Cor. Crag at 

 Ramsholt, and, so far as its imperfect condition will permit of comparison, I still think it 

 may retain the name previously given to it, but with the same doubt. Abundant 

 fragments of a fibrous shell, that I think can only belong to some species of Pinna, 

 were sent to me by Mr. Gunn from the Contorted Drift of the Cromer Cliff. 



Pinna rudis ? Linn. Supplement, Tab. IX, fig. 11. 

 Locality. Cor. Crag, Aldbro. 



This specimen was obtained from the Polyzoan or Coralline Bank at Aldbro by the 

 late Rev. T. Image, and placed in the Museum at Bury St. Edmunds. I am indebted to 

 the kindness of Mr. H. Prigg, jun., of that town, and to the Museum Committee, for the 

 use of it for the present figure. The specimen is embedded in the hardened matrix, and 

 a portion of the shell at the smaller end has been removed. { 



Philippi says " Genus Pinnarum valde intricatum. 5 ' That remark, perhaps, cannot 

 be restricted to the genus Pinna ; still, with the very imperfect materials afforded by the 

 Cor. Crag, I think it desirable to give these specific names provisionally. 



Fragments of Pinna are not uncommon both in the Cor. and Red Crags, but they 

 are wholly indeterminable. 



Mytilus edulis, Linn., var. giganteus ? Supplement, Tab. VIII, fig. 4. 

 Locality ^ Red Crag, Sutton. 



The above represents a specimen of Mytilus in a very mutilated condition, but it 

 indicates a magnitude for the shell when perfect of its having been six inches in 

 length, and as this far exceeds the size of M. edulis of our own shores, I have thought 

 it deserving of being figured. It came from the nodule pits in the Red Crag at Sutton, 

 and may possibly be another species derived from some older formation. M. edulis, either 

 whole or in fragments, is common to all the East Anglian beds except the Coralline 

 Crag, in which only M. hesperianus occurs. 



The variety tinyulatus I have not seen from the Coralline Crag, but it is given from it 

 by Mr. Bell in 'Proceedings of the Geologists' Association,' April, 1872. 



