. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 253 ORBIPORA DISTINCTA (Eichwald). Plate 3, figs. 10-lOb; text figs. 144-147. Orhitulites distinctus Eichwald, Zool. spec, vol. 1, 1829, p. 180. Favosites hemlsphsericus Kutorga, Beitrag zur Pal. Dorpats, 1835, p. 40, pi. 8, figs. 5 a-c (not pi. 9, fig. 3). Orbipora distincta Eichwald, Bull. Soc. Nat. Moscou, No. 1,1856, p. 93; Letligea Rossica, vol. 1, sect. 1, 1860, p. 484, pi. 28, figs. 6, 7 a-c—Dybowski, Die Chsetetiden der Silur-Formation, 1877, p. 60, pi. 2, figs. 10, 10a, 106. Chaetetes
. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BRYOZOA OF THE BALTIC PROVINCES. 253 ORBIPORA DISTINCTA (Eichwald). Plate 3, figs. 10-lOb; text figs. 144-147. Orhitulites distinctus Eichwald, Zool. spec, vol. 1, 1829, p. 180. Favosites hemlsphsericus Kutorga, Beitrag zur Pal. Dorpats, 1835, p. 40, pi. 8, figs. 5 a-c (not pi. 9, fig. 3). Orbipora distincta Eichwald, Bull. Soc. Nat. Moscou, No. 1,1856, p. 93; Letligea Rossica, vol. 1, sect. 1, 1860, p. 484, pi. 28, figs. 6, 7 a-c—Dybowski, Die Chsetetiden der Silur-Formation, 1877, p. 60, pi. 2, figs. 10, 10a, 106. Chaetetes hemisphaericus Eichwald, Lethsea Rossica, vol, 1, sect. 1, 1860, p. 476, pi. 28, fig. 5. The general ciiaracters of this species have been mentioned in the discussion of the genus, but these, as well as the more specific points, are given in the following diagnosis. Zoarium consisting of a flattened, discoidal mass, sometimes as much as 40 mm. wide and 7 mm. in its greatest height, flat or slightly concave and covered with a wrinkled epitheca on its lower side, slightly convex on the upper or celluliferous surface. Maculae either absent or differing so little from surrounding areas that they are indis- tinguishable. The surface is without monticules or elevations of any sort, but is roughened by numerous sharp acan thopores. Zooecial tubes large, polyg- onal, usually hexagonal, varying from mm. to mm. in diameter. Mesopores absent entirely. Acan thopores numerous, as many as 16 surrounding a single Fig. 144.—Oebipoea distincta. a and b, BASAL AND CELLUUFEKOUS SIDES OF A YOUNG ZOAErUM,NATURAL SIZE, DESCEIBED BY Eichwald as Chaetetes hemispher- icus; c, side view of the same specimen; d, cellulefeeous sitkface enlaeged. "Calcaiee a. Orthoceratites," Pul- Petersburg. (After Eichwald.). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app
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