PLATE XIII. 



Cucull-Ea {continued). 



FIGS. 



1 — 3. G, nana, Leym. Gault, Folkestone. British Museum, No. L 4946. 

 (P. 62.) 



1. a, left valve; b, dorsal of same; c, same x 2; d, left X 2 ; e, anterior view x 1\. 



(The umbo is slightly pressed in, and consequently in 1 a, d, appears less sharp 

 than usual.) 



2. Right valve x 2. 



3. Left valve ; the posterior margin is slightly imperfect, x 1£. 



4, 5. C. Mailhana (d'Orb.). (P. 63.) 



4. Chalk Marl, Pinhay Cliffs. Collection of C. J. A. Meyer, a, left valve ; b, same, 



x 1| ; c, same, dorsal, x 1\. 



5. Chloritic Marl, Maiden Bradley. "Woodwardian Museum. "With the shell partly 



removed, a, right valve; b, dorsal of same specimen. 



6. C, sp. Chalk Marl (Bed 10), Dunscombe. Collection of C. J. A. Meyer. 

 a, right valve ; b, dorsal outline ; c, ornamentation x 4. (P. 64.) 



Genus Isoakca, Milnster. 



7. I. Agassizi, Pict. and Roux. Cambridge Greensand (derived). Internal 



mould. Figured by Jukes-Browne. Woodwardian Museum. 

 a, left valve ; b, dorsal. (P. 65.) 



8. I. obesa (d'Orb.). Chloritic Marl, Ball Wood. Museum of Practical 



Geology, No. 6340. a, left valve ; b, dorsal ; c, ornamentation 

 X 5. (P. 65.) 



Genus Pectdnculus, Lamarck. 



10. Pectunculus marullensis, Leym. Ferruginous Sands, Shanklin. Collec- 

 tion of C. J. A. Meyer. (P. 66.) 



0. Left valve, a, x 2; b, interior ; c, dorsal outline. 

 10. Left valve x 3 (another specimen). 



