. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 307 there are all degrees of gradation in the extent and elevation of the maculae, so that little question can be raised as to the specific identity of the forms here considered as synonyms. Comparing Dybowski's figures, we find that in Trematopora cingulata (pi. 3, figs. 1, Ih) the maculae do not rise above the general surface and are so elongated transversely as to form encircling rings, T. cingulata var. nodosa (pi. 3, fig. la) differs only in having these ring-like maculae shghtly elevated
. Bulletin - United States National Museum. Science. EAELY PALEOZOIC BEYOZOA OP THE BALTIC PROVINCES. 307 there are all degrees of gradation in the extent and elevation of the maculae, so that little question can be raised as to the specific identity of the forms here considered as synonyms. Comparing Dybowski's figures, we find that in Trematopora cingulata (pi. 3, figs. 1, Ih) the maculae do not rise above the general surface and are so elongated transversely as to form encircling rings, T. cingulata var. nodosa (pi. 3, fig. la) differs only in having these ring-like maculae shghtly elevated. In T. variabilis (pi. 3, figs. 2, 2a) the maculae, although transversely elongate, are arranged somewhat irregularly and the acanthopores are more numerous. T. variabilis var. complanata (pi. 3, figs. 3, 3a) has the same zooscial structure and differs only in the very irregularly shaped monticules. Dybowski's tangential sections (pi. 3, figs, lb, 2a, 3a, 4a, and 4c) are sufficient in themselves to show the identity of his various species, but the only illustration of T. pustulifera (pi. 3, fig. 6) shows apparently a somewhat different internal structure. Examination of Dybowski's type-specimen,. 'it%£:. 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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