. Bulletin - United States National Museum. Science. PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 261 quently these semidiaphragms are seen to be placed directly opposite each other in the same tube. In such a case, the structure is exactly the same as the centrally perforated diaphragm of Stenopora. At other times the partition extends only partially around the circum- ference of the cell and appears in sections as a single projecting semi- diaphragm. The typical form of the species is illustrated in figure 152. The regular hemispheric, solid zoarium is made up of a number of distinct. F
. Bulletin - United States National Museum. Science. PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 261 quently these semidiaphragms are seen to be placed directly opposite each other in the same tube. In such a case, the structure is exactly the same as the centrally perforated diaphragm of Stenopora. At other times the partition extends only partially around the circum- ference of the cell and appears in sections as a single projecting semi- diaphragm. The typical form of the species is illustrated in figure 152. The regular hemispheric, solid zoarium is made up of a number of distinct. Fig. 152.—Esthoniopoea communis, a, side view of an aveeage specimen, natueal size; 6, basal VIEW OF SAME SHOWING EPITHECA AND CICATRIX OF ATTACHMENT; C, TANGENTIAL SECTION, X20, OP AVEEAGE ZOCECIA ; d, SEVEEAL ZOCECIA OF THE SAME SECTION, X35, ILLUSTEATING SIMPLE, AMALGAMATED WALL STEUCTUEE; e, VEETICAL SECTION, X8, THEOUGH TWO ZOAEIAL LATEES; /, POETION OF THE SAME SECTION, X20. JEWE LIMESTONE (Dl), BAEON TOLL'S ESTATE, ESTHONIA. zoarial layers, two of which are shown in the vertical section, figure 152 e. As usual in such zoaria, the tubes of these individual layers are placed so nearly on top of each other that they form practically one and the same tube throughout the colony. In figure 154 the zoarium consists of a single layer in which the semidiaphragms are placed opposite each other with considerable regularity. Whenever tabulae of this sort are cut by the tangential. 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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