PLATE V. 



LIMA (continued). 



FIGS. 



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



1. Zone of Adinocamax quadratus, 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 ;'&, 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. Tealby 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. L. (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. L. (Mantellum) parallela, Sow. Lower Greensand (Perna-loed), 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. 



16 20. L. (Mantellum) gaultina, Woods. Gault. 16 19, Black Ven. 20, 

 Folkestone. Sedgwick Museum. (P. 31.) 



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



17. Eight valve. 



18a, ,, 6, antero-dorsal view. 



19. median portion x 6. 



20. Left valve 



