PLATE V. 



Fig. 



1. Pecten orbicularis, var. magnus, Kpng., Upware. 



2. Avicula Comueliana, d'Orb., Upware. 



3. Perna, sp. nov., Upware (Coll. J. F. Walker, M.A.). 



4. PUcatula Carteronicma, d'Orb., Upware. 



5. PUcatula equicostata, Kpng., Upware. 



6. Lima longa, Homer, Upware. a, a decorticated specimen ; b, 



round ribbed, elongated type, d, flat ribbed variety. 



7. Area Carteroni, d'Orb., Upware. a, umbonal view; b, back view; 



c, the ribbed surface, magnified. 



8. CucuUaea, sp., Upware. 



9. Pectunculus lens, Sby., Upware. b, interior, shewing teeth; c, 



surface magnified. 



10. CucuUaea subnana, Pictet and Roux, Upware, 



11. Pectunculus Maridlensis, Leym., Up wave. 



12. Lima Farringdonensis, Sharpe, Upware. b, section across the 



ribs ; c, surface of ribs, magnified. 



