XII. 



STREPTOSPOND YL US. 



323 



Admitting, however, all the bones to belong to one animal, and 

 regarding it as a megalosaurus, smaller and in some respects dif- 

 ferent from M. Bucklandi, we have only to adopt among the 

 characters of that genus some forms of the vertebrae not previously 

 known, and especially a peculiar pattern of cervical vertebrae, which 

 were similar to but more in number than those in the neck of 

 certain fossil crocodiles. The animal, on the whole, must have had 

 the ornithic proportions and analogies of Megalosaurus Bucklandi. 



REFERENCE TO PLATE XIII., REPRESENTING FOSSILS OF THE 

 COEALLINE OOLITE AND CALCAREOUS GRIT. 



1. Carpolithus plenus, fruit. 



2. Cross section of the same. 



3. Montlivaltia dispar. a. Septa. 



4. Thecosmilia annularis. 



5. Cladophyllia Conybeari. 



6. 7. Thamnastrsea arachnoides, to shew 



variations (from Steeple Aston). 



8. Nastraea explanata. 



9. Stylina De la Bechei. 6. One of the 



cells (from Steeple Aston). 



10. Comoseris irradians (from Steeple 



Aston). 



11. Rhabdophyllia Phillipsii, 



12. Cidaris Smithii, tubercle and ambu- 



lacral ray. 



1 3. Cidaris florigemma, tubercle and am- 



bulacral ray. 



14. Hemicidaris intermedia, tubercle and 



ambulacra! ray. 



15. Hanipedina Marchamensis, a row of 



tubercles and half an ambulacrum. 



1 6. Pygaster umbrella, a. An ambula- 



crum. 



17. Pygurus costatus. 6. The ambula- 



crum. 



1 8. Echinobrissus dimidiatus. a. The rays. 



19. Ostrea gregarea. 



20. Pecten vimineus. a. The scaly ribs. 



21. Gervillia aviculoides. 



22. Lima rigida. a. The elevated striae. 



23. Lima laeviuscula. a. The punctated 



strise. 



24. Pecten lens. a. The punctated striae. 



25. Modiola bipartita. 



26. Astarte ovata. 



27. Pholadomya obsoleta. 



28. Myacites recurvus. 



29. Opis Phillipsii. 



30. Trigonia clavellata. 



31. Area semula. 



32. Trigonia clavellata. 



33. Lithodomus inclusus. 



REFERENCE TO PLATE XIV., REPRESENTING FOSSILS OF THE 

 CORALLINE OOLITE AND CALCAREOUS GRIT. 



1. Chemnitzia Heddingtonensis. 



2. Natica arguta. 4 



3. Phasianella striata. 



4. Nerita brevispiralis. n. s. 



5. Littorina muricata. 



6. The beaded striae. 



7. Cast of the interior of Chemnitzia 



Heddingtonensis. 



8. Belemnites abbreviatus. 



9. Ammonites excavatus. 



10. varicostatus. 



11. perarmatus. 



12. vertebralis. 



13. Nautilus hexagonus. 



Y 2 



