. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. FiQ. 634.—Trlplesia extaus. Mus. Nat. Hist., p. 44. [Ety. <r»|/'a8io8, thrice; in allusion to the trilobate character of the shell.] Shell trans- verse or elongate, trilobate or subtri- lobate; ventral valve deeply sinuous and dorsal, having a corresponding fold; hinge-line straight; area small; foramen triangular; surface concen- trically striated; ventral valve with a strong tooth on each side of the fissure;
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. FiQ. 634.—Trlplesia extaus. Mus. Nat. Hist., p. 44. [Ety. <r»|/'a8io8, thrice; in allusion to the trilobate character of the shell.] Shell trans- verse or elongate, trilobate or subtri- lobate; ventral valve deeply sinuous and dorsal, having a corresponding fold; hinge-line straight; area small; foramen triangular; surface concen- trically striated; ventral valve with a strong tooth on each side of the fissure; muscular impressions small; dorsal valve with a prominent bifurcating cardinal process, on each side of which there is a brachial process di- rected obliquely inward and laterally. Type T. extans. congesta, Conrad, 1842, (Atrypa congesta,) Jour. Acad. Nat. Sci., vol. 8, p. 265, and Pal. N. Y., vol. 2, p. 67, Clinton Gr. cuspidata. Hall, 1847, (Atrypa cuspidata,) Pal. N. Y., vol. 1, p. 138, Trenton Gr. nucleus, Hall, 1847, (Atrypa nucleus,) Pal. N. Y., vol. 1, p. 138, Trenton Gr. ortoni, Meek, 1872, (Dicraniscus ortoni,) Am. Jour. Sci. and Arts, 3d ser., vol. 4, p. 280, and Ohio Pal., vol. 1, p. 178, Niagara Gr. primordialis, Whitfield, 1878, Ann. Rep. (leo. Sur. Wis., p. 51, and Geo. Wis., vol. 4, p. 172, Potsdam Gr. putillus, liall, Bvn. for T. waldronensis. radiata, Whitfield, 1889, Bull. Am. Mus. Nat. Hist., vol. 2, p. 43, Calciferous Gr. waldronensis. Miller & Dyer, 1878, (Spirif- era ? waldronensis,) Jour. Cin. Soc. Nat. Hist., vol. 1, p. 37, Niagara Gr. ["koi'idoleptus, Hall, 1857, proposed in 10th Rep., but described in 1859 in 12th Rtp. N. Y. Mus. Nat. Hist., p. 31. [Ety. tropia, the keel or bottom of a ship; leptos, slender.] General form of Stro- phomena; surface plicated; structure punctate; ventral valve convex, with an area and wide fissure beneath the beak ; dental lamellae distinct from the margin of the fissure, crenulatc; dorsal valve concave, w
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