. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 488 LAMELLHiRANCHIA TA. curtUB, Ilartt, 18<J8, Acad. Geol., p. 302, Carb. delicatuB, Meek & Worthen, 1870, Proc. Aond. Nat. Sci., p. 40, and Geo. 8ur. 111., vol. 5, p. 575, Up. Coal Meas. hamiltoniir, Hull, 1870, Prelim. Notice Lam. Shells, p. 13, and Pal. N. Y., vol. 5, pi. 51. figs. 1-10, Ham. Or. hardingi, llartt, 1868, Acad. Geol., p. 302, Carb. micronema, Maek & Worthen, 1806, Proc. Acad. Nat. Sci.
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. 488 LAMELLHiRANCHIA TA. curtUB, Ilartt, 18<J8, Acad. Geol., p. 302, Carb. delicatuB, Meek & Worthen, 1870, Proc. Aond. Nat. Sci., p. 40, and Geo. 8ur. 111., vol. 5, p. 575, Up. Coal Meas. hamiltoniir, Hull, 1870, Prelim. Notice Lam. Shells, p. 13, and Pal. N. Y., vol. 5, pi. 51. figs. 1-10, Ham. Or. hardingi, llartt, 1868, Acad. Geol., p. 302, Carb. micronema, Maek & Worthen, 1806, Proc. Acad. Nat. Sci., p. 261, Kaskaskia Gr. obsoietns. Meek, 1871, Rpg. Rep. Univer- sity W. Vh., p. 5, and Pal. Oliio, vol. 2, p. 334, Coal Fig. 846.—Matherlii tener. ovatus. Hall, 1870, Prelim. Notice Lam. Shells, p. 15, and Pal. N. Y., vol. 5, p. 351, Waverly Gr. parvus. White & Whitfield, 1862, Proc. Bost. Soc. Nat. Hist., vol. 8, p. 299, Kinderhook Gr. sangamonensis, Worthen, (in press,) Geo. Sur. 111., vol. s, p. 123 Coal Meas. shnbenacadiensis, Hartt, 1868, Acad. Geo. p. 302, Carb. tenuistriatus, Meek & Worthen, 1867, Proc. Chi. Acad. Sci., vol. 1, p. 17, Up. Coal Meas. truncatus, Walcott, 1885, Monogr. U. S. Geo. Sur., , p. 243, Carboniferous. Matheria, Billings, 1858, Can. Nat. and Geo., vol. 3, p. 440. [Ety. proper name.] Eguivalve, inequilateral; beaka anterior; two small, obtuse, cardinal teeth in the left valve, and one in the right; no lateral teeth; two muscular impressions; ligament ex- ternal. Type M. tener. tener, Billings, 1858, Can. Nat. and Geo., vol. 3, p. 440, Trenton Gr. Megalomus, Hall, 1852, Pal. N. Y., vol. 2, p. 343. [Ety. megas. great; omos, shoulder.] Large, equivalve, concen- trically lined, longitudinal; umbones anterior incurved; shell thick and along the hinge-line thickened on the interior; muwular impression large and deep, with two small circular pits above. Type M. canadensis. canadensis. Hall, 1852, Pal. N. Y., vol. 2, p. 343, Guelph
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