41 



BIVALYIA. 



Anomia striata, S. Wood. 2nd Sup., Tab. VI, fig. 3 a—f; Crag Moll., vol ii, p. 11, 



Tab. II, fig. 3; 1st Sup., p. 100. 



Diameter, 1-fths of an inch. 



Locality. Cor. Crag, Sutton and near Orford. 



In my figure and description of this shell in the ' Crag. Moll.,' above referred to, the 

 exterior only is represented. I now give, therefore, one of the interior of a specimen of 

 similar magnitude, and also a separate fig. (3 c), representing the thickened portion of 

 the lower valve, which resembles what I erroneously figured in ' Crag. Moll.' (vol. ii, 

 Tab. XXXI, fig. 24), as possibly the internal shell of Aplasia. The lower valve of 

 Anomia is very thin, except the ridge, which is represented in fig. 3 d, which, therefore, 

 is the only part of this valve usually found ; but fig. 3 e represents a perfect specimen of 

 this valve, showing the opening for the byssus close to the connecting ligament. 



Fig 3/ represents a small specimen of the upper valve from the Coralline Crag of 

 Sutton, which shows that the shell in its young condition is perfectly free from striae, 

 these appearing when it is a little further advanced in life. This is the only specimen 

 out of many hundreds that I have obtained from the Cor. Crag in which this feature is 

 shown. 



Ostrea ungtjlata, Nyst. 2nd Sup., Tab. V, fig. 7 a, b; Crag Moll., vol. ii, Tab. II, 



fig. 1 a. 



Ostkea tjngulata, Nyst., var. A. Coq. Foss. Belg., pl.xxxiv, fig. 1. 



Locality. Cor. Crag, Ramsholt. 



I have here given another figure of the Ostrea occurring in the Coralline Crag, which 

 was in the ' Crag Mollusca ' referred by me to edulis, and of which a specimen 

 with the two valves united is represented in fig. 1 a of Tab II of vol. ii of that work. I 



6 



