href="@public@vhost@g@gutenberg@html@files@36261@[email protected]#f14" class="pginternal" tag="{http://www.w3.org/1999/xhtml}a">24

15. Small weathered specimen of Eozoon 28 16. Nature-printed specimen of Eozoon slightly etched with acid 29 17. Magnified group of canals in supplemental skeleton of Eozoon 31 18. Portion of Eozoon magnified 100 diameters 31 19. Magnified portion of shell of Calcarina 32 20. Amœba, a fresh-water naked Rhizopod; and Actinophrys, a fresh-water Protozoon 34 21. Nonionina, a modern marine Foraminifer 34 22. Stromatopora concentrica 35 23. Caunopora planulata 36 24. Archæocyathus minganensis. A Primordial Protozoon 37 25. Receptaculites. Restored 38 26. Section of Loftusia Persica. An Eocene Foraminifer 39 27. Foraminiferal Rock Builders, in the Cretaceous and Eocene 41   Frontispiece. Paradoxides Regina (Matthew) 44 28. Group of Cambrian Animals 46 29. Portion of skeleton of Hexactinellid Sponge (Cœloptychium) 49 30. Protospongia fenestrata (Salter) 50 31. Astylospongia præmorsa (Roemer) 51 32. Spicules of Lithistid Sponge (Trichospongia, Billings) 51 33. Oldhamia antiqua (Forbes) 52 34. Dictyonema sociale. Enlarged 52 35. Dictyonema Websteri (Dn.) 53 36. Group of modern Hydroids allied to Graptolites 54 37. Silurian Graptolitidæ 55 38. Central portion of Graptolite, with membrane, or float (Dichograpsus octobrachiatus, Hall) 55 39. Ptilodictya acuta (Hall). Bryozoan 55 39a. Fenestella Lyelli (Dn.). A Carboniferous Bryozoan 56 40. Chaetetes fibrosa. A Tabulate Coral with microscopic cells public@vhost@g@gutenberg@html@files@36261@[email protected]#f40" class="pginternal"