. Bulletin - United States National Museum. Science. 126 BULLETIN 77, UNITED STATES NATIONAL MUSEUM. made up of similarly modified zooecia and broad interspaces. In all cases, the elevated lines traversing the interspaces are minutely papillose. Views of the internal structure are given in figure 50. Occurrence.—Eichwald mentions two localities for his species, first, the ''calcaire a Orthoceratites'' at Reval, and, second, the dolomite Pliyckholm-Borkholm formation] at Borkholm. The nmnerous examples coming from the Wassalem beds (D3) at Uxnorm, in the vicinity of Reval, identical with his fi
. Bulletin - United States National Museum. Science. 126 BULLETIN 77, UNITED STATES NATIONAL MUSEUM. made up of similarly modified zooecia and broad interspaces. In all cases, the elevated lines traversing the interspaces are minutely papillose. Views of the internal structure are given in figure 50. Occurrence.—Eichwald mentions two localities for his species, first, the ''calcaire a Orthoceratites'' at Reval, and, second, the dolomite Pliyckholm-Borkholm formation] at Borkholm. The nmnerous examples coming from the Wassalem beds (D3) at Uxnorm, in the vicinity of Reval, identical with his figured specimen, cause me to beheve that the latter was derived from the same place. Eichwald's Borkliolm specimens probably belong to the species next described as Graytodictya obligua. The American occurrences are (1) in the Clitambonites bed of the lower Trenton limestone, near Kenyon, I^iinnesota, and (2) in the lowest Trenton or late Black Kiver limes- tone, along the Escanaba River, IVIichigan, below the falls. Plesiotypes.—Csit. No. 57216, Specimens and thin sections from the Wassalem beds at Uxnorm, Esthonia, are in the collections of the British Museum. GRAITODICTYA OBLIQUA, new species. Plate 8, fig. 4; text fig. 51. Compared with other cribrose species, this new form differs so decidedly in zooecial structure that it need be discriminated only from the abundant Graptodictya proava (Eichwald), of the Wassalem beds. Careful comparison shows the following differences: First,. 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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