. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fig. t)99.—Pleuronotus decewl. t\ (lecewi, Billings, 1861, (Euomphalus (iecewi,) Can. Jour., p, 358, Up. Held. Gr. Plei'kotomaria, Defrance, 1824, Tableau d. Corps. Organises Fossiles, p. 114, and Diet. Sci. Nat, t. 41, p. 381. [Ety. pleura, side; tome, cut or notch.] Shell trochi- form, more or less conical, pearly within, variable in thickness, with or without an umbilicus; volutions angular, flat- tened, or rou
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. Fig. t)99.—Pleuronotus decewl. t\ (lecewi, Billings, 1861, (Euomphalus (iecewi,) Can. Jour., p, 358, Up. Held. Gr. Plei'kotomaria, Defrance, 1824, Tableau d. Corps. Organises Fossiles, p. 114, and Diet. Sci. Nat, t. 41, p. 381. [Ety. pleura, side; tome, cut or notch.] Shell trochi- form, more or less conical, pearly within, variable in thickness, with or without an umbilicus; volutions angular, flat- tened, or rounded; surface ornamented with striae, nodes, granulations, or car- inse; aperture sub- qnadrate. semioval, suborbicular, or sub- rhombic ; inner lip thin; fissure of outer lip narrow and fk*. too.—Pieuroto- deop; revolving niaila angllca. band corresponding in depth with the sinus. Type P. an- \ glica. abrupta, Billings, 1859, Can. Nat. and Geo., i vol. 4, p. 354, Calciferous (ir. acadicu, Dawson, 1883, Rep. on Redpath ! Mus., p. 11, Subcarboniferous. adamsi, Worthen, 1884, Bull. No. 2, 111. St. Mus. Nat. Hist., p. 5, and Geo. Sur. 111., vol. 8, p. 137, Coal Meas. , adjutor. Hall, 1879, Pal. N. Y., vol. 5, pt. 2, p. 80, Up. Held Gr. advena, Winchell, 1864, Am. Jour. Sci. and Arts, 2d series, vol. 37, p. 228, Pots- , dam Gr. i agaiista, Billings, 1865, Pal. Fobs., vol. 1, I p. 230, Quebec Gr. 1. egave, Billings, 18(15, Pal. Foss., vol. 1, p. 170, Trenton Gr. arabigua, Hall, 1847, Pal. N. Y., vol. 1, p. 176, Trenton Gr. americana, Billings, 1860, Can. Nat. and Geo., vol. 5, p. 164, Trenton Gr. amphitrite, Billings, 1862, Pal. Foss., vol. 1, p. 32, Chazy or Black F'v. Gr. angnktta, Conrad, 1843, Proc. Acad. Nat. Sci. Phil. This name was preoccupied by Sowerby. antiquata. Hall, 1847, Pal. N. Y., vol. 1, p. 31, Chazy (.ir. aperta, see Raphistoma apertum. apicalis. Hall, 1S70, lUust. Devonian Foss., pi. 20, and Pal. N. Y., vol. 5, pt. 2, p. 88, Chemung Gr. arabella, Billings,
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