. The algae. Algae. reproduction; evolution 299 Cyclocrinus (Fig. 179) is a genus which grew to about seven centi- metres and looked like a miniature golf ball borne on the end of a stalk. Narrow branches arose at the apex of the stalk and each ter- minated in a flattened hexagonal head, but as the edges of adjoining heads were fused together to form the outer membrane, which was only weakly calcified, the cell outlines were clearly visible. Many species are known from the Ordovician and Silurian, all somewhat resembling the living genus Fig. 180 Dasycladaceae. Primicorallina trent
. The algae. Algae. reproduction; evolution 299 Cyclocrinus (Fig. 179) is a genus which grew to about seven centi- metres and looked like a miniature golf ball borne on the end of a stalk. Narrow branches arose at the apex of the stalk and each ter- minated in a flattened hexagonal head, but as the edges of adjoining heads were fused together to form the outer membrane, which was only weakly calcified, the cell outlines were clearly visible. Many species are known from the Ordovician and Silurian, all somewhat resembling the living genus Fig. 180 Dasycladaceae. Primicorallina trentonensis ( x 825). (After Hirmer.) Primicorallina (Fig. 180), from the Ordovician, had a segmented stem beset with radially arranged branches, each of which branched twice into four 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, V. J. (Valentine Jackson), 1910-. London, Macmillan; New York, St. Martin's Press
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Keywords: ., bo, bookcentury1900, bookcollectionbiodiversity, booksubjectalgae
