110 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Pinna prctinata? Linn. Crag Moll., vol. ii, p. 50, Tab. VIII, ime, dLit. 
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. 
Prxna rnupis? 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 Rey. 'l’. 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.”’ 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 Pcxva are not uncommon both in the Cor. and Red Crags, but they 
are wholly indeterminable. 
Myvinus Eepunis, Zinn., var. GIGANTEUS P Supplement, Tab. VIII, fig. 4. 
Locality ~ Red Crag, Sutton. 
The above represents a specimen of A/ytilus 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 J. 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 J. hesperianus occurs. 
The variety wngulatus 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. 
