﻿BIVALVIA. 



153 



The localities of Thorpe, Bulchamp, and Chillesford are on the authority of the late 

 Dr. Woodward's list, and, as I have not been able to confirm them, they are given with 

 doubt. A specimen sent to me by Messrs. Crowfoot and Dowson from Aldeby seems 

 not to be sufficiently perfect to be free from doubt. 



Abra fabalis, S. Wood. Crag Moll., vol. ii, p. 238, Tab. XXII, fig. 12. 



Dr. Homes has given this Crag shell as a synonym to the fossil from the Vienna 

 basin, which he has called Syndosmya apelina, Kien, vol. ii, p. 77, Tab. VIII, fig. 4. This 

 shell, however, judging from the figure he gives, resembles Liyula profundissima, Forbes ; 

 but mine is, I think, distinct from either, and I have, therefore, retained its original 

 name. 



Scrobicularia plana, Da Costa. Crag Moll., vol. ii, p. 235, Tab. XXII, fig. 14 (as 



Trigonella plana) . 



Localities. Red Crag, Bawdsey ? Chillesford, and Sudbourn. Chillesford bed, 

 Horstead, Chillesford, Tunstall Heath, and Sudbourn Church Walks. Fluvio-marine 

 Crag, Bramerton. Lower Glacial, Belaugh. Middle Glacial, Billockby and Hopton. 

 Post-glacial, March, Hunstanton, Nar Valley, Pentney. 



The presence of this shell on the comparison of the Bramerton and Chillesford sections 

 is discussed in the introduction to this Supplement. It occurs abundantly in the newest 

 part of the Red Crag and in the Fluvio-marine Crag at Bramerton. It is not uncommon 

 in the Lower Glacial sands, and in the Middle Glacial sands the hinge portion of 

 specimens are very abundant. In all but the uppermost part of the Red Crag (4'" of the 

 Introduction to this Supplement, page viii), of which it is the characteristic shell, it was 

 unknown to me, but I understand from Mr. A. Bell that he has found it at Bawdsey. 



Mactra ovalis, J. Soio. Crag Moll., vol. ii, p. 246, Tab. XXIII, fig. 1. 



Localities. Red Crag passim excepting at Walton. Fluvio-marine Crag passim. 

 Chillesford Bed passim. Lower Glacial, Belaugh, and Middle Glacial, Billockby and 

 Hopton. Post-glacial, Kelsea Hill, Paul Cliff, March, and Hunstanton. 



This shell abounds in every part of the Red Crag, excepting at Walton and in the 

 Fluvio-marine Crag in the Chillesford bed and in the Middle Glacial, but is somewhat rare 

 in the Lower. 



