﻿BIVALVIA. 



143 



In his list in ' White's Directory ' Dr. Woodward gives this shell from the Norwich 

 Crag on the authority of a single valve in Mr. Wigham's collection. I have not been 

 able to learn from other sources of its occurrence in that Crag, and have, therefore, 

 placed a note of interrogation to it. In the Middle Glacial sands of Hopton there have 

 occurred many imperfect specimens, composed of the hinge and umbonal region, that 

 seem referable to this species. 



Venus fasciata, Crag Moll., vol. ii, p. 2*11, Tab. XIX, fig. 5. 



Localities. Red Crag, Sutton and Walton. Fluvio-marine Crag, Bramerton. 

 Middle Glacial, Billockby and Hopton. 



This shell is somewhat rare both in the Red and Fluvio-marine Crags, and I have 

 not met with it from any of the localities of the Chillesford bed or from the Lower 

 Glacial sands. In the Middle Glacial, both at Hopton and at Billockby, it is in extra- 

 ordinary profusion, but mostly in a fragmentary condition, the hinges being extremely 

 abundant. Very few perfect specimens, and those only of young individuals, have 

 occurred. 



Venus ovata. Crag Moll., vol. ii, p. 213, Tab. XIX, fig. 4. 



Localities. Cor. Crag passim. Red Crag, Sutton, Butley. Chillesford Bed, Aldeby. 

 Middle Glacial, Billockby and Hopton. 



This shell, so profuse in the Cor. Crag, is exceedingly rare in the Red and does not 

 appear to have been met with at all in the Fluvio-marine Crag, but it has been found in 

 the Chillesford bed at Aldeby by Messrs. Crowfoot and Dowson. I have not seen it 

 from the Lower Glacial sands, but it is common, though usually in a fragmentary 

 condition, in the Middle Glacial of Hopton and Billockby, only very young specimens 

 occurring perfect. 



Venus verrucosa, Linn. 



This, in ' Brit. Conch.,' vol. ii, p. 341, is given as a " Cor. Crag species " (S. Wood), 

 but in vol. v, p. 184, it is said " not Coralline Crag." I have not seen it, however, from 

 any of the Tertiaries of East Anglia. It is, I believe, not rare in the Post-glacial 

 deposit at Selsey in Sussex, and it is present, also, in the Clyde beds and Belfast 

 deposit. 



