156 SUPPLEMENT TO THE CRAG MOLLUSCA. 
A fossil in my possession from Bordeaux, with the name of Z. 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 Z. sauna given by Basterot, Pl. 7, fig. 13. I 
have under these circumstances omitted the name of Z. oblonga from my 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 7. pubescens (¢ Crag Moll.,’ vol. i, p. 259, Tab. XXVLI, fig. 1 e, detruncata), 
but I do not feel fully justified on the authority of this solitary distorted specimen in adopting 
the name of disforta into the list of Crag shells, and I give it, therefore, with doubt. 
e 
Taracta PAPyRACEA, Poli. Crag Moll., vol. u, p. 260, Tab. XXVI, fig. 2 (as Zhr. 
phaseolina). 
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 
Cochlodesma, judging from the representation of the hinge. 
THRacia ventricosa, Phil. Crag Moll., vol. 1, 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 My. Jeffreys accompanying Mr. Prestwich’s paper, this Coralline Crag shell is 
referred to Mya convera, 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 convera. In 
the ‘Crag Mollusca’ 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 
