. Bulletin - United States National Museum. Science. Isssr %lir"ââ Fig. 174.âHemipheagma panderi. a, vertical section, X20, showing the large, thick semi- diaphragms; 6, THE USUAL VIEW SEEN IN TANGENTIAL SECTION, X20; C, PORTION OF SAME, X40, SHOWING STRUCTURE OF WALLS AND ACANTHOPORES. KUCKERS SHALE (02), BARON TOLL'S ESTATE, ESTHONIA. HEMIPHRAGMA PANDERI (Dybowski). Plate 3, figs. 9-9c; text fig. 174, Orbiipora panderi Dybowski, Die Chaetetiden der Ostbaltisclien Silur-Formation, 1877, p. 66, pi. 2, figs. 9-9c. Cfr. Hemiphragma ottawaense (Foord), Contr. Micro-Pal. Cambro-Sil., 1883, p.
. Bulletin - United States National Museum. Science. Isssr %lir"ââ Fig. 174.âHemipheagma panderi. a, vertical section, X20, showing the large, thick semi- diaphragms; 6, THE USUAL VIEW SEEN IN TANGENTIAL SECTION, X20; C, PORTION OF SAME, X40, SHOWING STRUCTURE OF WALLS AND ACANTHOPORES. KUCKERS SHALE (02), BARON TOLL'S ESTATE, ESTHONIA. HEMIPHRAGMA PANDERI (Dybowski). Plate 3, figs. 9-9c; text fig. 174, Orbiipora panderi Dybowski, Die Chaetetiden der Ostbaltisclien Silur-Formation, 1877, p. 66, pi. 2, figs. 9-9c. Cfr. Hemiphragma ottawaense (Foord), Contr. Micro-Pal. Cambro-Sil., 1883, p. 18, pi. 2, figs. 1-1/. Dybowski has given sufficient illustrations of this fine species (see pi. 3, figs. 9-9c) to make its identification easy, and the additional figures here presented are introduced to exhibit features of internal structure not shown by the author of the species. As Dybowski's figures show, the species is an undoubted typical HemipTiragma, and to one acquainted with American forms its resemblance to Hemi- pTiragma ottawaense (Foord), from the lowest Trenton of Canada, is very striking. This resemblance is most marked in the surface features of the zoarium and in the internal structure seen in vertical sections. Tangential sections show, however, that the Russian spe- cies has more angular zooecia, more numerous and more regularly arranged acanthopores, and fewer mesopores or closed interspaces. Thus, while the two are closely related, and possibly one is only a. 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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