. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Ylllg lamellose on front part of valve. Randall's collections at War- ren, Pa. Specimens 9614, 9615, 9619 ; wrongly labelled Allo- risma. VIII g. Ptychopteria mesocostalis, H. S. Williams. U. S. Geolog- ical Survey, Bull. No. 41, 1887, pages 35, 36, plate 3, fig. 9, en- larged twice^ doubtful genus, in Portage shales at Warsaw, N. Y.; fig. 12, enlarged twice^ left valve, variety, from same at Attica, N. Y. VIII f, Ptychopteriaobsoleta, new species Simpson. Tr
. A dictionary of the fossils of Pennsylvania and neighboring states named in the reports and catalogues of the survey ... Paleontology. Ylllg lamellose on front part of valve. Randall's collections at War- ren, Pa. Specimens 9614, 9615, 9619 ; wrongly labelled Allo- risma. VIII g. Ptychopteria mesocostalis, H. S. Williams. U. S. Geolog- ical Survey, Bull. No. 41, 1887, pages 35, 36, plate 3, fig. 9, en- larged twice^ doubtful genus, in Portage shales at Warsaw, N. Y.; fig. 12, enlarged twice^ left valve, variety, from same at Attica, N. Y. VIII f, Ptychopteriaobsoleta, new species Simpson. Trans. Amer. Phil. So. Philada, 1889, page 448, fig. 15. '"^""'WHPk Species based on Randall's specimen 9622, U, y. wrongly labelled Yoldia. Shell of medium size, subrhomboidal in outline; body ovate oblique, at an angle of about forty degrees APS Tr. 1889 to the Mugoline; height about three-fourths the length. Anterior margin abruptly rounded; basis margin curved outward at the extremities, concave at the middle; pos- terior margin somewhat abruptly recurved. Right valve un- known. Left valve moderately convex; greatest convexity at the umbonal regions. Hinge line essentially straight; length a little less than that of the body. Beak situated at about the anterior fourth of the shell, small, extending beyond the hinge line. A shallow broad sinus extends from the beak to the basal margin a little anterior to the middle. Anterior extrem- ity acuminate, margin rounded. Wing triangular, joining the body at the posterior extremity; margin for a short distance straight, then abruptly curving forward, and just before reach- ing the cardinal line curving upward. Wing convex; flattened 26. 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 Commiss
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleontology, bookyea
