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SUPPLEMENT TO THE CRAG MOLLUSCA. 



are but very faintly perceptible in the Red Crag specimens and not at all in the Glacial 

 one ; possibly in both this may be due to wear. One other valve, which is imperfect and 

 which more agrees with the typical form, is all that I have met with from the Middle 

 Glacial sands. 



Astarte excurrens ('Crag Moll.,' vol. ii, p. 191, Tab. XVII, fig. 9) seems more 

 probably to belong to the genus Woodia than to Astarte, and I have so placed it in the 

 tabular list. 



Cyprina Islandica. Crag Moll., vol. ii, p. 196, Tab. XVIII, fig. 2. 



Localities. Cor. Crag, passim. Red and Fluvio-marine Crags, and Chillesford bed, 

 passim. Lower Glacial, Rackheath, Belaugh, and Weybourne. Middle Glacial, 

 Billockby, Hopton, and Wisset. Upper Glacial, Bridlington, and Dimlington. Post- 

 glacial, March and Kelsea Hill. 



This shell is very common in some localities of the Coralline Crag ; plentiful in the 

 Red Crag, though seldom perfect ; common in the Fluvio-marine Crag and Chillesford 

 beds at all localities, as well as in the Lower Glacial sands of Belaugh, Rackheath, and 

 Weybourne, and in the Middle Glacial sands of Hopton and Billockby. It occurs in 

 the gravel of this deposit also at Wisset (north-west of Hales worth). It is common in 

 the March gravel, and a fragment is mentioned by Mr. Jeffreys at Kelsea Hill. 

 It is the universal shell of nearly all the Upper Tertiaries of East Anglia, but does not 

 appear to have occurred in the Nar Brickearth. 



Cyprina rustica, Soto. Crag Moll., vol. ii, p. 197, Tab. XVIII, fig. 1. 



This was at one time abundant in the Cor. Crag at Ramsholt and also near Orford, 

 and I have found it, though rarely, in the Red Crag at Sutton, where probably it may 

 have been a derived shell. The late Mr. Rose informed me that he had found it in the 

 sand of Bradwell (Middle Glacial), but the fragment in his collection to which this 

 name was attached appeared to me to be an imperfect specimen of some species of 

 Cardium, with its surface eroded. 



Cytherea rudis, Poli. Crag Moll., vol. ii, p. 208, Tab. XX, fig. 5 a — d. 



Localities. Cor. Crag passim. Red Crag passim. Fluvio-marine Crag, Norwich ? 

 Middle Glacial, Hopton. 



