. Australasian fossils, a students' manual of palaeontology. Paleontology. fig. 33.—Fossil Corals (Favosites). Photograph of a Polished Slab, % nat. size. In Devonian limestone, Buchan, Victoria. Fig. 34.—Siliceous Skeleton of a Living Hexactinellid Sponge. Probably Chonelasma. X4. Mauritius. (Viewed in Two Directions. ( Co//.). Fig. 34. polyps build their tiers of cells (coenosteum) in a regular manner, and seem to have played the same part in the building of ancient reefs in Silurian, Devonian and Carboniferous times as the Millepora at the present day (Fig. 32). ANTHOZOA.—The true Coral
. Australasian fossils, a students' manual of palaeontology. Paleontology. fig. 33.—Fossil Corals (Favosites). Photograph of a Polished Slab, % nat. size. In Devonian limestone, Buchan, Victoria. Fig. 34.—Siliceous Skeleton of a Living Hexactinellid Sponge. Probably Chonelasma. X4. Mauritius. (Viewed in Two Directions. ( Co//.). Fig. 34. polyps build their tiers of cells (coenosteum) in a regular manner, and seem to have played the same part in the building of ancient reefs in Silurian, Devonian and Carboniferous times as the Millepora at the present day (Fig. 32). ANTHOZOA.—The true Corals have a stony skele- ton, and this is capable of easy preservation as a fossil. There is hardly any fossiliferous stratum of importance which has not its representative corals. In Australia their remains are especially abundant in the Silurian, Devonian (Fig. 33), and Carboniferous; formations, and again in the Oligocene and Miocene. SPONGES.—The framework of the sponge may consist either of flinty, calcareous, or horny material (Fig. 34). The two former kinds are well repre- sented in our Australian rocks, the first appearing in the Lower Ordovician associated with graptolites, and. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Chapman, Frank M. (Frank Michler), 1864-1945. Melbourne, London [etc. ] G. Robertson & Company Propy. ltd.
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