PLATE XIIL 
Fig, 1. 
2 . 
3. 
4. 
5. 
6 . 
7. 
8 . 
9. 
10 . 
^Vertebrae of encrini, or trochitee of different kinds. 
A series of vertebrae, in which is shewn the kind of motion of which these bodies 
are capable. 
A distorted column, with the marks of attachment of vertebral processes. 
The screw-stone, or pulley-stone, being the cast in the hollow of a series of vertebrae. 
110 
12 . 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20 . 
=-The articulating surfaces of different encrinal vertebrae. 
21 . 
22 . 
23. J 
24. The tortoise encrinite. 
25.;) 
> The articulating surfaces of different encrinal vertebrae. 
08 . S 
29. A series of vertebrae. 
30. A single plate belonging to the tortoise encrinite. 
31. The stag’s-horn encrinite. 
32. A series of oval vertebrae. 
33. A vertebra with a curious articulating surface. 
34. The straight encrinite. 
35. A vertebrae of the straight encrinite, 
gy" I An asterial fossil from America ; probably of the nature of the encrinus. 
38. The apparent base of the stag’s-horn encrinus. 
39. Branches of the stag’s-horn encrinite. 
40. An oval vertebra. 
41. A vertebra of the same animal, shewing the articulating surfaces crossing each 
other, and thus allowing a total change in the position of the different parts of 
the vertebral column. 
42 . -] 
43. 
44. 
=■ Parts of 
45. 
46 .- 
different vertebral columns of encrini. 
