LIST OF ILLUSTRATIONS 



1. Terebratula intermedia - 



2. Ornithella obovata 3 



3. Brachial Loops - -6 



4. Hemiihyris psittacea - X 3 



5. Bathonian Terebratulacea 21 



6. Leptccna rhomboidalis - -26 



7. Various Brachiopods 3 



8. Palaeozoic Rhynchonellids 3 6 



9. Deltidial Plates of Rhynchonellids 37 



10. Evolution of the Loop in Long-looped Terebratulacea 40 



11. Pcctunculus glycimeris - - 48 



12. Pcctunculus glycimeris - - 49 



13. Nucula - 53 



14. Trigonia bronni - 55 



15. Cyrena - - 57 



16. Heterodont Hinges - 59 



17. Crassatella ponder osa - - 62 

 1 8. Meretrix incrassata - 63 



19. Pseudomonotis ecliinata - 65 



20. Ostrea ventilabrum ~ ^7 



21. Corbula gallica - - 7 



22. Pholadomya - 7 1 



23. Lamellibranchs - 7& 



24. Heterodont Lamellibranchs - 83 



25. Fixed and Burrowing Lamellibranchs - 87 



26. Emarginula fissura - 9& 



27. Turritella imbricataria - 97 



28. Natica multipunctala - - IO 



29. Cerithium scrratum - 102 



