. Bulletin - United States National Museum. Science. 256 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. In thin sections the amalgamated cell walls and the very large acanthopores composed of a clear, almost structureless tissue are the most noteworthy features of the more minute details. Wherever an acanthopore occurs the walls are greatly thickened, but they are quite tliin in the intervening spaces. This alternate thickening and thin-. FiG. 148.—Orbipora souda. a, side vte-w, natural size, of the solid, massive type-specimen; 6, TANGENTIAL SECTION, X20, SHOWING ZOCECIAL STRUCTURE; C, VERTICAL

GLIX-115-RG8A2T

. Bulletin - United States National Museum. Science. 256 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. In thin sections the amalgamated cell walls and the very large acanthopores composed of a clear, almost structureless tissue are the most noteworthy features of the more minute details. Wherever an acanthopore occurs the walls are greatly thickened, but they are quite tliin in the intervening spaces. This alternate thickening and thin-. FiG. 148.—Orbipora souda. a, side vte-w, natural size, of the solid, massive type-specimen; 6, TANGENTIAL SECTION, X20, SHOWING ZOCECIAL STRUCTURE; C, VERTICAL
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. Bulletin - United States National Museum. Science. 256 BULLETIN 11, UNITED STATES NATIONAL MUSEUM. In thin sections the amalgamated cell walls and the very large acanthopores composed of a clear, almost structureless tissue are the most noteworthy features of the more minute details. Wherever an acanthopore occurs the walls are greatly thickened, but they are quite tliin in the intervening spaces. This alternate thickening and thin-. FiG. 148.—Orbipora souda. a, side vte-w, natural size, of the solid, massive type-specimen; 6, TANGENTIAL SECTION, X20, SHOWING ZOCECIAL STRUCTURE; C, VERTICAL

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