. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. FiQ. 647.—MatthevlA variabilis. striatus, Hall, 1876, lllust. Devonian Foea., pi. 27, and Pal. N. Y., vol. 5, pt. 2, p. 199, Ham. Gr. Bubimbricatus, Binfiueberg, 1888, Proc. Acad. Nat. Sci. Phil., p. 136, Niag- ara Gr. triliratus, Hall, 1879, Pal. N. Y., vol. 5, pt. 2, p. 201, Ham. Gr. vanuxenii, Walcott, 1885, Monogr. U. 8. Geo. Sur., vol. 8, p. 86, Chazy Gr. Matthkvia, Walcott, 1885, Am. Jour. Sci. and Arts, 3d
. North American geology and palaeontology for the use of amateurs, students, and scientists [microform]. Paleontology; Paleontology; Geology; Paléontologie; Paléontologie; Géologie. FiQ. 647.—MatthevlA variabilis. striatus, Hall, 1876, lllust. Devonian Foea., pi. 27, and Pal. N. Y., vol. 5, pt. 2, p. 199, Ham. Gr. Bubimbricatus, Binfiueberg, 1888, Proc. Acad. Nat. Sci. Phil., p. 136, Niag- ara Gr. triliratus, Hall, 1879, Pal. N. Y., vol. 5, pt. 2, p. 201, Ham. Gr. vanuxenii, Walcott, 1885, Monogr. U. 8. Geo. Sur., vol. 8, p. 86, Chazy Gr. Matthkvia, Walcott, 1885, Am. Jour. Sci. and Arts, 3d ser., vol. 30, p 17. [Ely, proper name.] Shell conical; aperture sinuous, transverse section, ovate, el- ' liptical or rounded subquadrate; two elongate interior chambers, diverging from the apex, open into the terminal chamber, and are crossed by a single imperforate sep- tum; surface pa- pillose ; opercu- lum calcareous, nucleus excentric, lines of growth concentric. Type M. variabilis, variabilis, Walcott, 1885, Am. Jour Sci. and Arts 3d ser., vol. 30, p 18, Calciferous Gr. Pearetsella, Hall, 1888, Pal. N. Y., vol. 7, f>. 7. Shell large, elongate, Hyolithes- ike in outline ; apex acute; surface or- namented with transverse, undulating striae. Type P. tenebrosa. tenebrosa, Hall, 1888, Pal. N. Y., vol. 7, p. 7, Genesee Slate. Ptebotheca, Salter, 1852, Rep. Brit. Ass'n, [,wing;7'fti]. ing from the apex to the margin; ai'i>x slightly incurved opposite the carina; aperture nearly circular; surface fim iv reticulated. Type S. reticulata. conica, Vhiteaves, 1884, Pal. Fobs., vol. 3, p. 32, Guelph Gr. conula, Walcott, 1885, Ho. .(ui- Mouogr. U. S. Geo. *"*• Side view. Sur., vol. 8, p. 15, Up. Taconic. reticulata, Billings, 1872, Can. Nat. and Geo., vol. 6, p. 479, avid Pal. Foss., vol. 2, p. 77, Up. Taconic. retusa. Ford, 1873, Am. Jour. Sci. and Arts, 3d series, vol. 5, p. 213, I'li. Taconic. varians, Walcott, 1886, Bull. U. S. Geo.
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