. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Ptycho. 840 immediately below the cardinal line ; separated from the body by a narrow but conspicuous depression. Surface ornamented by faint radiating striae which are obsolete except on perfectly preserved specimens, and also by fine concentric striae, which frequently become fasciculate on the anterior portion of the shell. This species may be distinguished from any other at present known by the slight obliqueness of the body of the shell, the basal margin


. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Ptycho. 840 immediately below the cardinal line ; separated from the body by a narrow but conspicuous depression. Surface ornamented by faint radiating striae which are obsolete except on perfectly preserved specimens, and also by fine concentric striae, which frequently become fasciculate on the anterior portion of the shell. This species may be distinguished from any other at present known by the slight obliqueness of the body of the shell, the basal margin being nearly parallel with the hinge line; the margin is decidedly convex; in nearly all other species it is straight or concave; the wing extends beyond the body of the shell. The outline is very similar to that of some forms of the genus Oypricardinia. Hill north of Warren, Warren county, Pa. Chemung, VIIIg. Ptychopteria proto, Hall, Pal. N. Y., Vol. V i, plate 23, '^' i^,.^-.^t-^^ ^^^' 1^'14^ ^^^ l^f^ valves; â >:-.^ A^ li^^k found in the Upper Chemung. ^\U ^^^F ^^^9H|k near Smethport,McKeanCo., u 1/ n /â¢/* ^JIH^P Pa. Also Randall's Warren HalLFaLVf^phl^, ^i^ specimen No. 9590. VIIIg. Ptychopteria salamanca, Hall, Pal. N. Y. Vol. V i, 1884,. 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


Size: 2087px × 1197px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea