PLATE V. 



Lima (continued). 



Figs. 



1 — 4. L. (Plagiostoma) cretacea, Woods. (P. 22.) 



1. Zone of Adinocamax qnadratus, East Harnham. Dr. Blackmore's Collection. 



a, left valve ; b, portion x 6. 



2. Zone of Micraster cor-testudinarium, Borstal. Mr. Dibley's Collection. Left 



valve. 



3. Zone of Holaster planus, Cheveley. Sedgwick Museum. Left valve. 



4. Zone of Micraster cor-testudinarium, Cuxton. Mr. Dibley's Collection, a, left 



valve ; b, postero-ventral portion x 4. 



5. L. (Plagiostoma) sp. (? var. of cretacea). Chalk (? zone of Holaster planus), 

 Burham. Sedgwick Museum. Left valve. 



6, 7. L. (Plagiostoma) Marrotiana, d'Orb. Zone of Belemnitella mucronata, 

 Norwich. Norwich Museum. (P. 24.) 



6 a, left valve ;'b, mid-ventral portion x 3. 



7 a, anterior area of right valve ; b, median portion of left valve of same specimen. 



8—12. L. (Acesta) longa, Romer. (P. 25.) 



8. Lower Greensand, Upware. Mr. J. F. Walker's Collection, a, right valve; b, 

 portion below the middle of the valve x 5. 

 9, 10. Lower Greensand, Brickhill. Eight valves. Sedgwick Museum. 



11. Teal by Limestone (zone of Belemnites brunsvicensis) , North Willingham. Right 



valve. Sedgwick Museum. 



12. Speeton Clay, Speeton. Museum of Practical Geology, No. 8781. a, right 



valve ; b, portion x 4. 



13. Ij. (Acesta) sp. Lower Greensand, West Dereham. Sedgwick Museum 

 (collected by Mr. Jukes-Browne), a, right valve; b, antero-dorsal 

 view ; c, portion X 5. (P. 26.) 



14, 15. Ij. (Mantellum) parallela, Sow. Lower Greensand (Perna-hed), Ather- 

 field. (P. 28.) 



14. Left valve. Sedgwick Museum. 



15. British Museum, No. L 5066. a, left valve; b, dorsal view; c, portion at 



anterior end X 3 ; d, mid- ventral portion x 6. 



1G— 20. L. (Mantellum) gaultiua, Woods. Gault. 10—19, Black Ven. 20, 

 Folkestone. Sedgwick Museum. (P. 31 .) 



16a, left valve; b, antero-dorsal view. 



17. Right valve. 



18a, ,, b, antero-dorsal view. 



19. „ median portion X 6. 



20. Left valve 



