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SUPPLEMENT TO THE CRAG MOLLUSCA. 



Cardita corbis, Phil Crag Moll, vol. ii, p. 168, Tab. XV, fig. 2 a, b (as Cardita 



cordis, var. nuculina). 



■Localities. Cor. Crag, Sutton. Red Crag, Walton. Middle Glacial, Hopton. 

 Living in the Mediterranean. 



A single valve is all that has occurred in the Middle Glacial. 



Cardita anceps, S. Wood. Crag Moll., vol. ii, p. 168, Tab. XV, fig. 2 c, d (as Cardita 



corbis, var. exigud). 



Venerecardria anceps, (S 1 . Wood. Catalogue, 1840. 



Locality. Cor. Crag, Sutton. 



In my 'Catalogue' of 1840 I gave this shell under the above specific designation, 

 but in the ' Crag Mollusca ' I placed it as a variety of C. corbis, under the name of exigua, 

 supposing it to be identical with Dujardin's Touraine shell of that name. My further 

 examinations have induced me to revert to my views of 1840, and I have accordingly 

 restored it as a species under the name of anceps. 



C. corbis {nuculina) is the only form that I have seen from the Red Crag, and this is 

 from Walton, where it is not very abundant. Cardita corbis is given from the Red Crag 

 at Waldringfield by Mr. Bell and by Mr. Jeffreys, but which of the two forms is referred 

 to I do not know. Cardita corbis is the same as the shell now found living in the 

 Mediterranean. 



Dujardin represents his nuculina as strongly radiated, and the exigua as having 

 somewhat oblique transverse ridges, but of the two Crag forms corbis, and anceps, it is 

 the latter only which is strongly radiated, from which it would seem that ift\\s Touraine 

 and Crag shells are identical it is anceps which must be referred to nuculina, and corbis 

 to exigua. The shape, however, of the shells would lead to the reverse of this reference, 

 and I am, therefore, very doubtful whether there be any identity between the two Crag 

 and the two Touraine shells. I think, therefore, that I do best and avoid confusion by 

 reverting to my ' Catalogue ' name of anceps for our present shell, rather than by referring 

 it to either nuculina or exigua. 



Among the synonyms of C. corbis I gave Cardita corbis, Nyst. This I now believe 

 to be incorrect, the Belgian Crag shell appearing to be different from either of the forms 

 found in the English Crag and to correspond with the Middle Oligocene shell called 

 Cardita laevigata by Dr. Speyer (' Mittel. Oligocan. Sollingen,' p. 60, Tab. Ill, fig. 7). 

 A shell called Woodia lavigata by Von Konen (' Mittel. Oligocan.,' p. 108, Tab. VII, 

 fig. 8, a — d) is probably the same, but this I have not seen as an English fossil, though 



