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SUPPLEMENT TO THE CRAG MOLLUSCA. 



Cardium Islandicum, Linn. 



Localities. Middle Glacial, Hopton ? Upper Glacial, Bridlington ? 



This species is given by Dr. Woodward in his list of Bridlington fossils (' Geol. 

 Mag.,' vol. i, p. 54), but the specimen in the British Museum, upon the authority of 

 which this was done, is too imperfect to be referred with certainty to any species. 

 Umbonal portions of a large Cardium similar to the Bridlington species occur in the 

 Middle Glacial sands of Hopton. These, so far as such fragments are reliable, may 

 possibly belong to C. Lslandicum, or as likely to C. decortication, and from this uncertainty 

 I have not thought it desirable to figure these fragments. 



Erycinella ovalis, Conrad. Crag Moll., vol. ii, p. 171, Tab. XV, fig. 10. 



Localities. Cor. Crag passim. Red Crag, Walton (J. Bell). Middle Glacial, 

 Hopton. 



In assigning the above name to the (once) common Cor. Crag shell I was, as explained 

 in the ' Crag Mollusca,' guided by the report on it kindly brought home for me from 

 Mr. Conrad by Sir Charles Lyell. I have some misgivings about the identity, not 

 having been able to see the American fossil, and if it should hereafter prove to be 

 distinct the specific name of pygmaa assigned to it in my Catalogue {' Ann. and Mag. 

 Nat, Hist./ Dec, 1840) will be applicable to it. 



It is singular that, though once very common in the Cor. Crag at Sutton, I have not 

 been able to find a specimen for many years, though I have sifted tons of the Cor. Crag 

 material from the identical spot and horizon at Sutton where I once found it common. 

 Mr. Bell ('Ann. and Mag. Nat. Hist.,' Sept., 1870) gives the species from the Red 

 Crag, Walton, but I have not seen the specimen. Five valves in fair preservation have 

 occurred in the Middle Glacial of Hopton. 



Coralliophaga cyprinoides. Crag Moll., vol. ii, p. 200, Tab. XV, fig. 7 a — d. 

 Locality. Cor. Crag, Sutton and Ramsholt, 



My specimens of this are still very rare and very small. It may possibly be the 

 same as Chama lithophaaetta, Broc, which is said to be a common living shell in the 

 Mediterranean, but in the uncertainty I do not think it is necessary to alter the name I 

 had previously given. It cannot be referred to lithophagella, Lam. (Cypricardia), an 

 externally ornamented West Indian species ; my shell is quite smooth. 



