. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 319 colony. The oldest portion of a zoarium the base and the edge of the celluliferous surface, exhibits a dense, sohd surface to the unaided eye, but when magnified, this region is seen to be made up of minute, thick-walled, round to hexagonal cells of a uniform diameter. In. Fig. 198.—Diploteypa bicoenis. a, tangential section, x20, showing the shape, size, and arrange- ment OF ZOCECIA AND MESOPOEES EST THE MATURE ZONE. THE MESOPORES AEE SHADED FOR CONVEN- IENCE OF recognition; 6, part of th
. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BEYOZOA OF THE BALTIC PROVINCES. 319 colony. The oldest portion of a zoarium the base and the edge of the celluliferous surface, exhibits a dense, sohd surface to the unaided eye, but when magnified, this region is seen to be made up of minute, thick-walled, round to hexagonal cells of a uniform diameter. In. Fig. 198.—Diploteypa bicoenis. a, tangential section, x20, showing the shape, size, and arrange- ment OF ZOCECIA AND MESOPOEES EST THE MATURE ZONE. THE MESOPORES AEE SHADED FOR CONVEN- IENCE OF recognition; 6, part of the same SECTION, X40; C, VERTICAL SECTION, X20, SHOWING THE REGULAR AND CLOSE ARRANGEMENT OF TABULiE IN THE MESOPORES AISTD THEIR lEEEGULAR DISTRIBU- TION IN THE ZOCECIA; d, VERTICAL SECTION, X40, ILLUSTRATING THE NOEMAL DISTRIBUTION OF PHRAGMS IN THE TWO KINDS OF TUBES. HERE ONE OF THE ZOCECIA REPLACES TWO MESOPORES. THIN SECTIONS OF THE BASAL PART OF THIS SAME ZOARIUM ARE SHOWN IN FIG. 197. JEWE LIMESTONE (Dl), Baron Toll's estate, Esthonia. tangential sections through this and the adjacent normal celluhferous area, the zocEcial walls are seen to become so thickened by the deposit of a dense tissue that the diameter of the orifice is the same as that of the mesopores. The same thickening of the walls is well exhibited in vertical sections where the mesopores also are noted to be invested. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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