16. Organisms in Richmond earth.
17. Ideal section of the crust of the earth.
18. Unconformable junction of Chalk and Eocene rocks.
19. Erect trunk of a _Sigillaria_.
20. Diagrammatic section of the Laurentian rocks.
21. Microscopic section of Laurentian limestone.
22. Fragment of a mass of _Eozoön Canadense_.
23. Diagram illustrating the structure of _Eozoön_.
24. Microscopic section of _Eozoön Canadense_.
25. _Nonionina_ and _Gromia_.
26. Group of shells of living _Foraminifera_.
27. Diagrammatic section of Cambrian strata.
28. _Eophyton Linneanum_.
29. _Oldhamia antiqua_.
30. _Scolithus Canadensis_.
31. Group of Cambrian Trilobites.
32. Group of characteristic Cambrian fossils.
33. Fragment of _Dictyonema sociale_.
34. Generalised section of the Lower Silurian rocks
of Wales.
35. Generalised section of the Lower Silurian rocks
of North America.
36. _Licrophycus Ottawaensis_.
37. _Astylospongia proemorsa_.
38. _Stromatopora rugosa_.
39. _Dichograptus octobrachiatus_.
40. _Didymograptus divaricatus_.
41. _Diplograptus pristis_.
42. _Phyllograptus typus_.
43. _Zaphrentis Stokesi_.