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SUPPLEMENT TO THE CRAG MOLLUSCA. 



Mactra solida, Linne. Crag Moll, vol. ii, p. 245, Tab. XXIV, fig. 4. 



Localities. Cor. Crag, near Orford. Red Crag, Sutton, Bentley and Butley. 

 Fluvio-marine Crag, Bramerton. Chillesford bed, Bramerton and Aldeby ? Post-glacial, 

 Kelsea Hill, March, and Nar Brickearth. 



A specimen from Aldeby, sent me by Messrs. Crowfoot and Dowson, is referable 

 with some doubt to this species. The specimen in the British Museum, which was the 

 authority on which Dr. Woodward gave it as from Bridlington, does not seem to me to be 

 a fossil of that place. It is said by Mr. Reeve to be now common at Bramerton. I 

 have had figured in my Supplement, Tab. X, fig. 10, a peculiar and angular form, from 

 Mr. Rose's collection, and this came from the Cor. Crag, near Orford. 



Mactra subtruncata, Da Costa, Crag Moll., vol. ii, p. 247, Tab. XXIV, fig. 3. 



Localities. Red Crag, Sutton ? Fluvio-marine Crag, Bramerton. Chillesford bed, 

 Aldeby. 



Mactra stultorum. Crag Moll., vol ii, p. 242, Tab. XXIII, fig. 3. 



Localities. Cor. Crag, Sutton. Red Crag, Sutton and Bawdsey {Bell). Fluvio- 

 marine Crag, Bramerton. Middle Glacial, Hop ton ? 



This shell seems to be rare in the Fluvio-marine Crag as well as in the Red, and not to 

 have occurred in either the Chillesford bed, or the Lower Glacial sands ; but a fragment 

 comprising nearly the whole of the anterior edge of the shell and the hinge, from the 

 Middle Glacial of Hopton, seems referable to this species. 



Mactra glauca. Crag Moll, vol. ii, p. 241, Tab. XXIII, fig. 2. 



In addition to the locality given in the ' Crag Mollusca ' I have obtained several 

 valves of this species from the Red Crag at Bentley, and I have seen others in the col- 

 lection of Mr. Miller, of Ipswich. Some fragments that I have from the Cor. Crag of 

 Sutton may probably be referred to this species ; but it is difficult to determine satis- 

 factorily from imperfect specimens the difference between glauca and stultorum. 



