. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 299 III J?.. nisenus arcturus. (Hall, Pal. N. Y. Vol. 1,1847. Chazy ew.,^M^v"i3 and Black River groups.) Emmons, Am. Geol. I, ii, 1855, page 235, plate 3, fig. 12; distin- guished by width of head lobe, at junction with throat (thorax), by the side extent of check- pieces, and by more distinct development of head lobes. Up- per part of Caloiferous sandstone formation. II a. lUsenus armatus. Hall, in CoUett's Indiana Report of 1881, page 335, plate 34, fi
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. 299 III J?.. nisenus arcturus. (Hall, Pal. N. Y. Vol. 1,1847. Chazy ew.,^M^v"i3 and Black River groups.) Emmons, Am. Geol. I, ii, 1855, page 235, plate 3, fig. 12; distin- guished by width of head lobe, at junction with throat (thorax), by the side extent of check- pieces, and by more distinct development of head lobes. Up- per part of Caloiferous sandstone formation. II a. lUsenus armatus. Hall, in CoUett's Indiana Report of 1881, page 335, plate 34, figs. 10, and 20; and plate 33,fig. 12. See Appendix for -figure, Illcenus harriensis. See lUaenus ioxus. V a^ h. Illsenus ioxus. {Bumastis harriensis^) Hall, plate fig. [11, 2] natural size. Hall, 1843, page 101, fig. 33,4, of a speci- men nearly twice as large as those com- monly seen,but not as large as the largest which have been found. Niag- ara formation, VI (See Mur- chison's Silurian Researches? page 656, plate 7 bis, figs. 3 a> b, c, d; plate 14, figs. 7 a, b.) Also Hall, plate 19 (11?) 1843, fig. 2, (with Lie has {Platynotus) boltoni, and Proetus (Asaphus) cory- phaeus.—In Pennsylvania, it has been found by 0. E. Hall, m the Clinton outcrops of Ferguson Valley, Huntingdon Co. (Proc. A. P. S. Phila. Jan. 5, 1876); and by J. J. Stevenson in shale partings of fossil ore hed at Wolfsburg, Bedford Co., Pa. (T2, 144.)—Va.—Note. An Illcenus is shown on specimen 506-32, of 0. E. HalPs collections 2 miles south of Bell's Mills, in Clinton red shale. Va,—For other figures^ taken from Hall, in Collett's Indiana Report of 1881,page 835,plate 33,f. 13,14, see Appendix,. 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 Seco
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