OF NORFOLK AND SUFFOLK. 



327 



The following list of fossil shells from the Norwich crag is the 

 joint work of Mr. Searles Wood, F.G.S., Mr. G. Sowerby, 

 F.L.S., and the author ; the fact of certain species being 

 common or not to the red and coralline crag of Suffolk, be- 

 ing given exclusively on the authority of Mr. Wood. 



LIST OF FOSSIL SHELLS FROM THE NORWICH CRAG. 



The fossil shells in this list have all been found in the immediate neigh- 

 ourhood of Norwich, except where Southwold is mentioned as the locality. 

 All the recent species, of which the habitations are not given, belong to the 

 British seas. 



Explanation of the Signs. — The * prefixed to a name implies that the 

 species is now living ; where a ? is added, the identification has been con- 

 sidered doubtful, either from the imperfect state of the specimens, or the 

 want of a sufficient number of fossil or recent individuals to allow of a sa- 

 tisfactory comparison. In estimating the per-centage of living species, two 

 of these doubtful cases have been counted as one, the authors anticipating 

 that at least one half of the number will eventually be identified. 



The mark in either of the columns headed 'Hed Crag' and ' Cor. 



Crag, ' denotes that the species against which it is placed is also found in 

 one or both older deposits. l Min. Con.' Sowerby's Mineral Conchology. 



MARINE SPECIES. 



1*Pholas crispata, Lamarck, 



*Solen siliqua, Lamarck, 



Mva lata, Min. Con 



pullus, including M. subovata of Woodw. list 



5* arenaria, 



* truncata, Mont 



*Lutraria compressa, Lam. (Mactra Listeri of 



Woodward), 



•P Mactra magna, Woodward, {Mactra stultorumP)... 



* solida, Mont. (Mac. ovalis, Min. Con.) 



10 arcuata, Min. Con 



* subtruncata, Mont. (M. cuneata of Woodw.) 



*Amphidesma Boysii, Leach, 



n. s. one valve only, 



*Corbula nucleus, Lam. (C. rotundata, Min. Con.) 



15*Saxicava rugosa, Lamarck, 



*Tellina crassa, Mont. (Tel. obtusa, Min. Con.) ... 



obliqua, Min. Con 



*? ovata, Min. Con. same as Tel. triangularis, 



Wahl. (Tel. calcarea of some authors) of Nor- 

 wegian seas, 



Tellin a pretenuis, Woodward, 



20* solidula, Montagu, found fossil at Crost- 



wick, near Norwich. 



-fabula, one valve of fossil from Southwold 



*P. 



Lucina, n. s. allied to divaricata. Mr. Wood thinks 

 that the ligament in this species was internal, 

 k radula, (L. antiquata, Min. Con.) 



Red Crag. Cor. Crag 



