PLATE LXI. 



OsTBEA (continued). 

 Figs. 

 1 — G. 0. Innata, Nilss. Zone of 0. lunafn, Triraiiig-ham. 1, 5, 6, Mr. R. M. 

 Brydone's Collection. 2 — 4, Sedgwick Museum, la, 2 — 5«, Ga, 

 left valves. \h, right valve of la; Ic, anterior view of 1«, 5^, 

 right valve of 5a. 6b, anterior view of Ga. (P. 393.) 



Gemcs — Exogtra, Sni/. 



7 — n. E. tabercnlifera, Koch and Dunk. Lower Greensand. (P. 40 1.) 



7. Crackers, Atherfield. British Museum, No. L 6461. a, right valve ; 6, left 



valve. 



8. Pt'c«n-bed, East Shalford. Sedgwick Museum. Left valve. 



9 — 11. Hythe Beds, Lympue. Museum of Practical Geology, Nos. 25957, 25958, 

 25968. Left valves. ILi, interior of 116. 



12. E. sigmolrlea, Reuss. Zone of Mir raster cor-aiuiuinum, Boxford. ^fr. 



LI. Treacher's Collection. Riglit valve. (P. 419.) 



13. E. siniiata (Hovi-.). /^'y«(?-l)ed, Atherfield. British Museum, No. L G306. 



Left valve. Variety of the laevigata form with ribs. (P. 39-5.) 



Supph'inenta nj figu res. 



14 — 17. Crenella orbicularis (Sow.). Upper Greensand (zone of ScMoenbachia 

 rostrata), Blackdown. Sedgwick Museum. 14, IG, right valves. 

 15, 17'/, left valves. I7h, dorsal view of 17'/,. x 2. (P. 423.) 



18. Pecteii, {Ghlamys) britannicus, AVoods. Zone of Micraster cor-anguinum, 



Bromley. Sedgwick Museum, a, right valve; b, portion above the 

 middle of the valve x 5. (P. 42 l.) 



19. Livui {Limea ?) sp. Speeton Clay, Speeton. Sedgwick Museum, a, 



right valve ; b, portion x G. (P. 425.) 



20,21. Grassatellites ? eqaisidcatn.^ (Wooda). Chalk Rock, Cuckliamsley. Sedg- 

 wick Museum. 20, left valve; 21, internal cast of right valve. 

 (P. 426.) 



