288 



PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 19, 



In this list of 52 species it will be seen that no less than 49 species, 

 or all but 3, occur in the Suffolk Crags ; 37 in the red, and 39 in the 

 Coralline crag. Thirty-one of the species are recent (60 per cent.), a 

 larger proportion than at Calloo. 



2. Middle or Grey Crag. — Next in age, in the opinion of M. de Wael, 

 is the grey crag before mentioned, called Crag gris, or Crag moyen» 

 It has afforded the largest number of fossil shells, as will be seen by 

 the following list. 



Table IV. 



Fossil Shells from the Middle Crag (Crag moyen or Crag gris), 

 collected hy M. Norbert de WaeL 



Cor. 



Red. 



Re- 

 cent. 



Corbula gibba, Oliv 



(Poromya) granulata, Nyst 



Mactra striata, Nyst 



Syndosmya prismatica, W. Wood ... 



Amphidesma prismaticum, Montag. 



JLigula donaciformis, Nyst. 



Tellina obhqua. Sow 



lupinoides, Nyst 



Benedenii, Nyst 



Lucina radula, Montag 



digitaria, Linn 



astartea, Nyst 



Axinus (Cryptodon) sinuosus, Donov. 



Diplodonta dilatata, Phil 



Cyprina rustica. Sow 



islandica, Linn 



Astarte mutabilis. Wood 



A.planata, Nyst (non Sow.). 

 borealis, Linn , 



A. plana. Sow. 



Basterotii, Lajonk 



Omalii, Lajonk 



Burtini, Lajonk 



obliquata. Sow 



gracilis, Goldf. 



corbuloides, Nyst 



sulcata, Mont 



Venus spadicea, Ren 



V. ovata, Mont. 



rudis, Poli 



imbricata. Sow...., 



Astarte imbricata, Sow. 



minima, Mont 



chione, var,, Linn 



V. chionoides, Nyst. 

 turgida, Sow 



V. multilamellata, Nyst. 



V. casina, Linn. 



