PLATE XLIV. 



LiurisTiiA {voittiiiiiciJ). 



Figs. 



1,2. L. {Pdlomya) gvjantea (Sow.). Upper Greensand, Blackdown. SedgAvick 



Museum, Cambridge, la, right valve; 1 /<, dort;al view of the same. 



2, left valve. (P. 257.) 



CUSPIDAKIA {rn)i fill ((I'll). 



3. C. S((b(niiU(()(a (Pict. and Camp.). Gault, Folkestone. Sedgwick Museum. 



a, right valve; //, ornamentation X o. (P. 259.) 



4. C. U(((l(ilat(i (Sow.). Gault, Folkestone. Sedgwick Museum. Right 



valve. (P. 260.) 



5, G. G. jndchvK (Sow.). 5, Upper Chalk, Xorwich. Norwich IMuseum. a, 

 internal cast of right valve ; h, dorsal view. G, Cluilk Rock, Henley 

 Park ; Sedgwick Museum, from Mr. L. Treacher's Collection ; right 

 valve. (P. 260.) 



7. C. p((lc](ca ? (Sow.), rpper Greensand, Devizes. British Lluseum, No. 



L21785. Internal cast, somewhat crushed. ((, right valve; b, dorsal 

 view. (P. 261.) 



8. a .? sp. Chalk Marl, Ventnor. British Museum, No. 88266. (P. 261.) 



