Fios. 



PLATE XIX. 



Genus — Crassatet.t.itks, Kriiqrr. 



1. ' '. iJirir.ieiifila, Woods. ITppor Grecnsaiid, Devizes. Museum of Pnictifal 

 Geology, No. ]')75(). n, left valve; /-, dorsal view. (P. 12S.) 



2, ■]. ('. viniliunen,His (d'Orb.). Cenomanian (Meyer's Bed, 10), Dunscombe. 

 Sedgwick Museum. (P. 12<».) 



2«, left vah'c ; 6, dorsal view; c, oniaiiieiiliilidu iR'ar the middle of the valve. 



X 4; d, ornamentation on the posterior area, x 4. 

 3. Eight valve. 



Genua — Antiiiixya, ^^(////. 



4, 5. .1. r((;///f/»^(. Woods. Folkestone l?eds, Folkestone. Sedgwick ^ruseum. 

 Right valves. 5 /;, part near tin' mid-vent lalhorder, X ■>. (1'. Iv50.) 



i. A. .sp. Lower Greensand ((^rackiM-s), Atliei'iield. Sedgwick Museum. 

 T>ert v;dve. (P. PlI.) 



Genus — Cyi'IMMa, Laui'irrl-. 



7-lo. ('. S>nissnrl (Urongu.). Lower Greensand (("rackers). Atiierlield (^e.xcept 

 tig. 7, I'lrud-hcd). Sedgwick Museum, e.\cei)t fig. lo. (!'. LM .) 



7. Left valve. 



8 a, left valve ; h, dorsal vit'W. 

 •1. 10. Left valves 



11(7, light valve; h, dorsal view. 



12. Left valve. 



13. British Museum, No. L .'i(il-. Lari^e form. ». left valve ; ?), <lorsal view. 



14. 6'. Nr*/r/ //•(>/■/ (Walker). Lower (1 reensand. I'lMvare. Sedgwick .Museum. 

 Left valve. (P. ];53.; 



