. Bulletin - United States National Museum. Science. mini// I A. Fig. 19.—Ceramopoea spongiosa. a, portion of a zoarium, natural size, showing concentric RINGS OP epitheca; 6 AND C, TANGENTIAL SECTION, X9, AND PORTION OF SAME, X20, SHOWING THE NUMEROUS CONNECTING PORES; d, TANGENTIAL SECTION OF THREE ZOCECIA, X20, EXHTBITrNG STRUCTURE OF "WALLS AND OF THE LUNARIUM; e AND/, VERTICAL SECTIONS, X9 AND X20, "WITH TABULATION AND CONNECTING PORES. WASSALEM BEDS (D3), UXNORM, ESTHONIA. >' Lunarium of considerable size but so irregular in old specimens that it can hardly be separated from
. Bulletin - United States National Museum. Science. mini// I A. Fig. 19.—Ceramopoea spongiosa. a, portion of a zoarium, natural size, showing concentric RINGS OP epitheca; 6 AND C, TANGENTIAL SECTION, X9, AND PORTION OF SAME, X20, SHOWING THE NUMEROUS CONNECTING PORES; d, TANGENTIAL SECTION OF THREE ZOCECIA, X20, EXHTBITrNG STRUCTURE OF "WALLS AND OF THE LUNARIUM; e AND/, VERTICAL SECTIONS, X9 AND X20, "WITH TABULATION AND CONNECTING PORES. WASSALEM BEDS (D3), UXNORM, ESTHONIA. >' Lunarium of considerable size but so irregular in old specimens that it can hardly be separated from the equally irregular zooecial wall. In young examples the relations of the zooecia, mesopores, and lunaria are more clearly shown. Here the zooecium is more rounded and has a distinct, slightly elevated, hood-shaped lunarium overarching the proximal fourth of the zooecial cavity. Mesopores are represented in such specimens by shallow pit-like depressions just behind the lunarium. While a considerable variation is shown at the surface of speci- mens according to their age, the internal characters of the species. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
