. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Orthis. 534. ^^ Orthus subcarinata, Hall. Pal. N. Y. Vol. 3,1859, p. pL 12, fig, 18, dor- sal in- terior; 19 a, V e ntral interior; JM 20^,dor- ^^ sal cast; 21, ven- ^*kralcast. Lower Helderherg. Recognized by Dr. Barrett in the Storm- ville shale or upper division of the Lower Helderberg forma- tion about Port Jervis. G6, p. 132.— VL Orthis subcircula. New species, Simpson, Trans. Amer. Yd ^.^-w . ^^ o Philosophical Soc. 1889, Vol. page—fig. founded on
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Orthis. 534. ^^ Orthus subcarinata, Hall. Pal. N. Y. Vol. 3,1859, p. pL 12, fig, 18, dor- sal in- terior; 19 a, V e ntral interior; JM 20^,dor- ^^ sal cast; 21, ven- ^*kralcast. Lower Helderherg. Recognized by Dr. Barrett in the Storm- ville shale or upper division of the Lower Helderberg forma- tion about Port Jervis. G6, p. 132.— VL Orthis subcircula. New species, Simpson, Trans. Amer. Yd ^.^-w . ^^ o Philosophical Soc. 1889, Vol. page—fig. founded on specimens 501-30, 41, 42. (00 Oat.) in Hale and Hall's collections; also 877-1, 878-1, 882-2, 6, got at the McKee's ore bank in Mifflin Co., Pa. Also at Orbisonia ore banks in Huntingdon Co., Pa.—Clinton^ Va, Shell broadly oval, nearly circular; height usually about three-fourths the width ; greatest width just below the middle; cardinal line short, length less than half the width of the shell; extremities curving outward, the lateral marginc abruptly rounded, and the basal margins broadly rounded; on the ven- tral valve slightly constricted at the middle. Dorsal valve flattened, greatest convexity a little below the beak, 2:ently sloping to the front and lower lateral margins, more abruptly curving to the cardinal extremities; at the middle of the base a shallow depression, which continues aboutone-half of the dis. tance to the beak. Ventral valve more convex, greatest con- vexity about one-third the length from the beak; beak incurved and projecting beyond the area line. Surface marked by conspicuous radiating strias, which are sometimes of uniform size, but usually near the base there are very fine alternating striae. The large stria3 are marked at in-. 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 work
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
