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SUPPLEMENT TO THE CRAG MOLLUSCA. 



A fossil in my possession from Bordeaux, with the name of L. sanna, which was sent 

 to me many years ago by the Comte du Chastel, seems to correspond with the specimen 

 now figured, but is unlike the figures of L. sanna given by Basterot, PI. 7, fig. 13. I 

 have under these circumstances omitted the name of L. oblonya from ray tabular 

 list. 



Thracia distorta ? Mont. 



This species is given by Mr. Jeffreys in his list to Mr. Prestwich's Cor. Crag paper, 

 as occurring in the Coralline Crag. The only specimen that has come to my knowledge, 

 upon which such reference could be made, is that figured by me in the ' Crag Mollusca ' as 

 a distortion of T.pubescens ( c Crag Moll.,' vol. ii, p. 259, Tab. XXVI, fig. 1 e, detruncata), 

 but I do not feel fully justified on the authority of this solitary distorted specimen in adopting 

 the name of distorta into the list of Crag shells, and I give it, therefore, with doubt. 



Thracia papyracea, Poll Crag Moll., vol. ii, p. 260, Tab. XXVI, fig. 2 (as Thr. 



p/iaseolina) . 



Localities. Cor. Crag, Sutton, and near Orford. Chillesford bed, Sudbourn Church 

 Walks. Lower Glacial, Belaugh. 



Two specimens of this species have been found at Sudbourn, and one by myself in 

 the Lower Glacial sand at Belaugh. This appears now to be generally admitted as 

 Tellina papyracea of Poli, and as that has precedence in date to Lamarck's name it is here 

 restored. Anatina papyracea, Gould, appears to be different, and to belong to the genus 

 Cocldodesma, judging from the representation of the hinge. 



Thracia ventricosa, Phil. Crag Moll., vol. ii, p. 262, Tab. XXVI, fig. 5. 

 Locality. Cor. Crag, Ramsholt, and near Orford. 



This is still with me a very rare shell. In ' Brit. Conch.,' vol. ii, p. 40, as also in the 

 list by Mr. Jeffreys accompanying Mr. Prestwich's paper, this Coralline Crag shell is 

 referred to Mya convexa, W. Wood, but I cannot change the name I originally gave to 

 the Crag shell, believing as I do that is distinct from this recent British shell convexa. In 

 the ' Crag Mollusca 5 I referred the Crag shell to Phillips' species ventricosa with 

 doubt, as it did not satisfactorily agree with a Sicilian specimen in my possession, but 



