BIVALVTA. 45 



Chama gryphoides, Linn., var. grtphina. 2nd Sup., Tab.V, fig.l a, b, c. 

 Chama gryphoides, Linn. Crag. Moll., vol. ii, p. 162, tab. xv, fig. 8. 



Locality. Red Crag, Waldringfield. 



The specimen here represented is from Mr. Canham's collection. This I have referred 

 as above, believing it to be merely a reversed form produced by the adherence of the right 

 valve instead of the left. The present specimen is from the Red Crag, but probably only 

 so by derivation from the Coralline. 



Lucina crassidens, S. Wood. 2nd Sup., Tab. V, fig. 4 a, b. 



Diameter, fths of an inch. 



Locality. Red Crag, Waldringfield. 



This is from Dr. Reed's cabinet ; and it is in all probability a derivative from some 

 anterior formation. The specimen seems to be not only full grown, but probably an old 

 individual with a thickened interior. It has a prominent umbo, with a very broad and 

 thickened hinge area. I thought at first sight that it might have been a specimen of 

 Lucina uncinata, an Eocene species, which has an elevated dorsal margin, but that shell 

 is much larger when full grown, and it has not the broad hinge of our shell. The 

 present specimen is quite smooth on the exterior, but it has probably been much rolled 

 and abraded. 



Another specimen of this genus, from the nodule workings in the Red Crag, which, 

 from having both valves adherent and filled with indurated material, is clearly also a 

 derivative, was given to me by Mr. Charlesworth many years ago, and this I believe to 

 be Lucina crassa from the Kimmeridge Clay. 



Lucinopsts Lajonkairii, JPat/r, var. subobliq.ua. Figured in margin. 



Locality. Cor. Crag, Ramsholt. 



A single valve of this species was found by myself some time ago, which in the 

 outline differs so widely from all other specimens I have seen, that I have had it 



