. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. mons, Amer. Geol. Vol. 1, part 2, p. 195, pi. 9, figs. 7 <^, 5/ valves unequally convex; about 20 ribs angular and divided twice or thrice near the middle.—Same as Orthis dichotoma (S. A, Miller). Pal. Ohio, Vol. 1, p. 106, pi. 8, fig. 6 a, S, c, ventral, dorsal, cardinal views; 6 6?, magni-fied surface striae crossed by minute lines of growth; 6 ^, profile of 6 <^/ 6 /, inside of a smaller dorsal valve, without visible muscular scars ; 6 ^, inside of v
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. mons, Amer. Geol. Vol. 1, part 2, p. 195, pi. 9, figs. 7 <^, 5/ valves unequally convex; about 20 ribs angular and divided twice or thrice near the middle.—Same as Orthis dichotoma (S. A, Miller). Pal. Ohio, Vol. 1, p. 106, pi. 8, fig. 6 a, S, c, ventral, dorsal, cardinal views; 6 6?, magni-fied surface striae crossed by minute lines of growth; 6 ^, profile of 6 <^/ 6 /, inside of a smaller dorsal valve, without visible muscular scars ; 6 ^, inside of ventral valve, hinge margin broken, show- ing obscure muscular cavity; 6/^,, inside ventral, small hinge teeth, no cavity.—Hudson river formation.^ Lllh, Orthis flabellulum, [O. callactis?) Hall, p. 105, fig. 36,5. Niagara formation. (0, ilaheUum^ name pre- occupied by Sowerby, 1839.) Found in speci- men 506-8, of C. E. Hall's collections, 1875, at Bell's Mills, Blair Co., Pa., from Clinton lime shale., Va. ^S*. 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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