. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. 901.âFsendomonotlB taawnl. hawni var. sinuata. Meek & Worthen, 1866, (Eumicrotis hawni var. sinuata,) Geo. Sur. 111., vol. 2, p. , Up. Coal Mens. radialis, (?) Phillips, 1834, (Pecten radi- alis,) Encyc. Meth., vol. 4, Coal Meas. Ptkrinka, Goldfuss, 182(J, Germ. Petref. [Ety. pteron, a wing.] Transversely trigonal, oblique, inequivalve, very in- equilateral, left valve most convex, beaks near the s
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fio. 901.âFsendomonotlB taawnl. hawni var. sinuata. Meek & Worthen, 1866, (Eumicrotis hawni var. sinuata,) Geo. Sur. 111., vol. 2, p. , Up. Coal Mens. radialis, (?) Phillips, 1834, (Pecten radi- alis,) Encyc. Meth., vol. 4, Coal Meas. Ptkrinka, Goldfuss, 182(J, Germ. Petref. [Ety. pteron, a wing.] Transversely trigonal, oblique, inequivalve, very in- equilateral, left valve most convex, beaks near the small anterior end; hinge-line long, straight, forming a small anterior and large falciform pos- terior wing, with a linear, flattene*!, marginal cartilage facet, longitudinally striated ; shell thick^ calcareous; two long, slightly divergnig, posterior, lat- eral teeth, beneath the hinge in one valve and one in the other; a few short, canllnal teeth radiating beneath and in front of the beaks; anterior im- Eression very strong just in front of the eak, posterior impression larger, but faintly iiiarked, superficial; pallial scar simple; shallow byssal concavity. Type P. 1h'v! Fig. demissa. appressa, Conrad, 1838, Ann. Rep. N. Y. Not defined. arenacea, Hall, 1877. Proposed, but not defined, aviformis, Conrad, 1842, (Avicula avi- formis,) Jour. Acad. Nat. Sci., vol. 8, p. 243, Trenton Gr. avis. Hall, 1884, Pal. N. Y., vol. 5, pt. 1, p. 105, Chemung Gr. bellilineata, Billings, 1866, Catal. Sil. Fobs. Antic, p. 15, Hud. Riv. Gr. bi8ulcata,Bee Grammysia bisulcata. brisa, Hall, 1867, 20th Rep. N. Y. Mus. Nat. Hist., p. 384, syn. for P. strijRcosta. cancellata, Barris, 1879, (Avicula cancel- lata,) Proc. Dav. Acad. Sci., vol. 2, p. 286, CorniferouB limestone. I', â â. 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 res
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