. Bulletin - United States National Museum. Science. EARLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 121 stome, which is elevated and prolonged at each end. The surface is also ornamented by a thin, papillose, wavy ridge separating the longitudinal rows of zooecia. The simple, unbranched segments of this species with their ends rounded for articulation with each other will distinguish them from all other associated bryozoans. Occurrence.—An abundant fossil in the lower half of the Black River (Decorah) shales, in Minnesota and Iowa; apparently rare in the Wassalem beds ,(D3) at Uxnorm. (Cat.
. Bulletin - United States National Museum. Science. EARLY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 121 stome, which is elevated and prolonged at each end. The surface is also ornamented by a thin, papillose, wavy ridge separating the longitudinal rows of zooecia. The simple, unbranched segments of this species with their ends rounded for articulation with each other will distinguish them from all other associated bryozoans. Occurrence.—An abundant fossil in the lower half of the Black River (Decorah) shales, in Minnesota and Iowa; apparently rare in the Wassalem beds ,(D3) at Uxnorm. (Cat. No. 57212, ). American specimens are in the collections of the British Museum. Genus GRAPTODICTYA Ulrieh. Graptodictya Ulrich, Journ. Cincinnati Soc. Nat. Hist., vol. 5, 1882, pp. 151, 165.—Miller, North Amer. Geol. and Pal., 1889, p. 307.—Ulrich, Geol. SuTV. Illinois, vol. 8, 1890, p. 393.—Pocta, Syst. Sil. Center Boheme, vol. 8, pt. 1, 1894, p. 14.—Simpson, Fourteenth Ann. Rep. New York State Geolo- gist for the Year 1894,1897, p. 541.—Nickles and Bassler, Bull. 173, U. S. Geol. Surv., 1900, p. 46.—Cumings, Thirty-second Ann. Rep. Dep. Geol. Nat. Res. Indiana, 1907, p. 747. This genus may be considered as an Arthropora with the jointed character of the zoarium limited to the base alone. The zooecial structure and surface ornament are alike in both genera, but the rather large, single, narrow branching frond of Graptodictya with a pointed, striated base articulating with a small basal expansion is wmm km. 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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