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SUPPLEMENT TO THE CRAG MOLLUSCA. 



BIVALVIA. 1 



Anomia ephippium, Linne. Crag Moll., vol ii, p. 8, Tab. I, fig. 3. 



Localities. Cor. Crag passim. Red Crag, Sutton. Fluvio-marine Crag, 

 Brainerton. Chillesford bed, Aldeby and Bramerton. Middle Glacial, Hopton and 

 Billockby. Upper Glacial, Bridlington {Woodward). 



In the Cor. Crag young specimens are very abundant, as they are also in the Middle 

 Glacial sands of Hopton and Billockby, and, unlike the general condition of the fossils of 

 those sands, they are usually uninjured. This species occurs in the Fluvio-marine Crag 

 of Bramerton, though rarely, but it is common in the Chillesford bed, where that bed is 

 not in the Fluvio-marine condition, as at Aldeby and Bramerton ; but I have not met with 

 it where it is in the Fluvio-marine condition, as at Horstead, Burgh, or Coltishall, nor in the 

 Lower Glacial sands. It is rare in the Red Crag. 



Anomia ephippium, var. aculeata, Midler. Crag Moll., vol. ii, p. 9, Tab. I, fig 2. 



Localities. Cor. Crag, Sutton. Chillesford bed, Aldeby and Bramerton. Middle 

 Glacial, Hopton. 



Specimens of this shell have been sent to me by Messrs. Crowfoot and Dowson from 

 Aldeby, and two young specimens have occurred at Hopton. 



Anomia striata, Brocchi. Crag Moll., vol. ii, p. 11, Tab. II, fig. 3. 



Localities. Cor. Crag passim. Red Crag, Sutton and Butley. Chillesford bed, 

 Aldeby. Middle Glacial, Hopton. 



A specimen of this shell was sent to me from Aldeby by Messrs. Crowfoot and 

 Dowson, and a solitary specimen was obtained by me from the Red Crag of Sutton, 



1 A system now prevails of restoring to a species the earliest name given to it from the date of Linnets 

 12th edition of his ' Syst. Nat.,' however long such name may have been in disuse. This is only fair and 

 just, and I have endeavoured to conform to such a rule ; but why this custom should be adopted with 

 respect to species, yet disregarded with respect to the more comprehensive divisions of the Animal 

 Kingdom, I am at a loss to understand, and I still see no reason why Linne's term of Bivalvia should 

 be superseded. 



