. Bulletin - United States National Museum. Science. n. r\\. Fig. 50.—Gbaptodictya peoava. o, tangential section, x20, cutting the striated edge of a beanch AND THE ADJOINING ZGCECIA; 6, PORTION OF THE SAME, X40; C, VERTICAL SECTION, X20. WaSSALEM BEDS (D3), UXNORM, ESTHONIA. or less irregular, large examples, such as illustrated on plate 9, figure 1, show them disposed in irregular, diagonal, intersecting rows. Zooecia subpolygonal, sometimes subrhomboidal in outline with eUiptical to circular apertures. Interspaces solid with one or two fiine, elevated, papillose lines. Mesopores restricted
. Bulletin - United States National Museum. Science. n. r\\. Fig. 50.—Gbaptodictya peoava. o, tangential section, x20, cutting the striated edge of a beanch AND THE ADJOINING ZGCECIA; 6, PORTION OF THE SAME, X40; C, VERTICAL SECTION, X20. WaSSALEM BEDS (D3), UXNORM, ESTHONIA. or less irregular, large examples, such as illustrated on plate 9, figure 1, show them disposed in irregular, diagonal, intersecting rows. Zooecia subpolygonal, sometimes subrhomboidal in outline with eUiptical to circular apertures. Interspaces solid with one or two fiine, elevated, papillose lines. Mesopores restricted almost entirely to the edges of the branches, where they form a band around the fenestrules about mm. wide. In the lower portion of old zoaria, the fenestrules are often obliterated by the greatly increased width of this band of mesopores. Occasionally a small mesopore or two may be noted among the ordinary zooecia. The articulating pointed base is composed of elongate, narrow, modified zooecia separated by wide, solid interspaces with niunerous elevated lines, this com- bination of elongate zooecia and intervening lines producing the striated appearance. The attached sockethke basal expansion is. 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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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
