. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 173 Cyclonema sub-angulatum. {Pleurotomaria sul-angu- lata, Hall, Trans. Alb. Inst. Vol. 4,1856. Whitfield Bull. 3, Am. Mus. N. IL, 1882, plate 8.) Collett's Indiana Rt. of 1882, page 364, plate 31, fig. 32.— Sub-carloniferous limestone of Spergen Hill, etc.^ Ind. This species of Cyclonema can be distinguished from all the other species of the genus, by the flat- fish, shelf-like upper part of each whorl, with a sharply angular edge. This is the distin
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 173 Cyclonema sub-angulatum. {Pleurotomaria sul-angu- lata, Hall, Trans. Alb. Inst. Vol. 4,1856. Whitfield Bull. 3, Am. Mus. N. IL, 1882, plate 8.) Collett's Indiana Rt. of 1882, page 364, plate 31, fig. 32.— Sub-carloniferous limestone of Spergen Hill, etc.^ Ind. This species of Cyclonema can be distinguished from all the other species of the genus, by the flat- fish, shelf-like upper part of each whorl, with a sharply angular edge. This is the distinguishing feature of the casts of the shell. No striae parallel to the lines of growth have been observed. There are traces of finer striae between the coarser revolving striae, which latter are unequal in size and distance from each other. Compare (7. yvanii, Leville. (Hall.)—XI. Cyclopteris digitata. Europe. Near Whittleseya elegans. —Note. The first specimen of Cyclopteris leaf attached to the leaf stem (rachis) recorded, may be seen in A. C. Seward's fine lithograph page-plate X, facing page 344, of the London Geolo- gical Magazine for August, 1888, No. 290.—X/77. Cyclopteris elegans. (Lesquereux. Boston Jour. 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 Lesley, J. P. (J. Peter), 1819-1903; Pennsylvania. Board of Commissioners for the Second Geological Survey. Harrisburg, Board of Commissioners for the Geological Survey
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