. Bulletin - United States National Museum. Science. FiG. 161.—Batostoma magnopora. a, small specimen of nattiral size; &, tangential section, X18; C, PART OF AXIAL REGION IN TRANSVERSE SECTION, X18; d, VERTICAL SECTION OF ZOARIUM WITH A NAR- ROW MATURE ZONE, X9. BlACK RiVEB (DECOBAH) SHALE, MINNEAPOLIS AND ST. PAXJL, MINNESOTA. (Aftek Uleich.). Fig. 162.—Batostoma magnopora. a, a small Russian example referred to the species, natural size; 6, TANGENTLAL section of same SPECIMEN, X20; C AND d, VERTICAL SECTION, XIO, AND A PORTION, X20. WASSALEM BEDS (D3), UXNORM, EsTHONIA. spicuous. In ver
. Bulletin - United States National Museum. Science. FiG. 161.—Batostoma magnopora. a, small specimen of nattiral size; &, tangential section, X18; C, PART OF AXIAL REGION IN TRANSVERSE SECTION, X18; d, VERTICAL SECTION OF ZOARIUM WITH A NAR- ROW MATURE ZONE, X9. BlACK RiVEB (DECOBAH) SHALE, MINNEAPOLIS AND ST. PAXJL, MINNESOTA. (Aftek Uleich.). Fig. 162.—Batostoma magnopora. a, a small Russian example referred to the species, natural size; 6, TANGENTLAL section of same SPECIMEN, X20; C AND d, VERTICAL SECTION, XIO, AND A PORTION, X20. WASSALEM BEDS (D3), UXNORM, EsTHONIA. spicuous. In vertical sections the tubes proceed toward the surface in a very gentle curve until they enter the unusually narrow peripheral region, where the curve is sufficiently accelerated to enable them to open at the surface with nearly direct. 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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