LIST OF WOODCUTS. 



t 



7. 



8. 



9. 

 10. 

 11. 

 12. 

 13. 

 14. 

 15 

 16. 

 17. 

 18. 

 19. 

 20. 

 21. 

 22. 

 23. 

 24. 

 25. 

 26. 

 j27. 

 28. 

 29. 

 ?0. 



Internal ridge of hyoid plate of Asterolepis 



Shagreen of Baia clavata, — of Sphagodus 



Scales of Acanthodes sulcatus : — shagreen of Scyllium stellare 



Scales of Cheiracanthus microlepidotus : — shagreen of Spinax 

 Acanthias ......... 



Section of shagreen of Scyllium stellare ■: — of scales of Cheir- 

 acanthus microlepidotus 



Scales of Osteolepis microlepidotus : — of an undescribed species 

 of Glyptolepis ........ 



Osseous points of Placoid Cranium ..... 



Osseous centrum of Spinax Acanthias : — of Raia clavata . 



Portions of caudal fin of Cheiracanthus :— of Cheirolepis 



Upper surface of cranium of Cod 



Cranial buckler of Coccosteus 



Cranial buckler of Osteolepis 



Upper part of head of Osteolepis 



Under part of head of Osteolepis 



Head of Osteolepis, seen in profile 



Cranial buckler of Diplopterus . 



Ditto 



Ditto (portion of) . 



Palatal dart-head, and group of palatal teeth 



Cranial buckler of Dipterus . , 



Base of cranium of Dipterus 



Under jaw of Dipterus 



Longitudinal section of head of Dipterus 



Section of vertebral centrum of Thomback 



Dermal tubercles of A sterolepis 



Scales of Asterolepis ... 



Portion of carved surface of scale 



Cranial buckler of Asterolepis . 



Inner surface of cranial buckler of A sterolepis 



Key -stone shaped plate in cranial buckler of A sterolepis 



7 



27 



28 



29 



of 



Diplopterus 



30 



31 

 38 

 39 

 42 

 44 

 46 

 47 

 49 

 61 

 62 

 53 

 64 

 65 

 66 

 68 

 68 

 69 

 61 

 64 

 67 

 68 



