58 BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Page. 



BJ? arenarium, n. s.,M. & W., 1868, pi. ix, figs. 2 a, & 409^10 



Zaphrentis, K. d^C, 1820 410 



Zaphrentis, -sp. undt., pi. Ix, fig.. 3 a, t 410 



Mollusca 410 



Brachiopoda 410 



Orthis, Dalman, 1828 410 



OrthU. uudt., pi. Ix, fifi. 4 410-411 



Strophomena, Knf., 1820 411 



S. (Stroptwdonta), sp. ? pi. ix, figs. 9 (and 7 a!) 411^12 



S. (Strophodonta), sp , pi. vi, figs. 6a, b 412 



Productus, Sowerby, 1814 412 



P. exanthematus, HalW. 1857, pi. x, figs. 3 a-c 412-413 



Spiri/er, Sowerbj-, 1815 414 



Subgenus Trvjunotrcta, Ko-nig, 1825 414 



S. perextenstis. u. s., M. &. W., 18t)8, jd. x, figs. 1 a-d ^ 414-415 



S. paradoxus, Schlot. ?? sp.,1813, pi. x, fig. 2 415-416 



Articulata 416 



Crustacea 416 



Dalm unit es. Auct 416 



Subgenus Odontoccphalus, Conrad, 1840 416 



Oduntocephalus ? pi. ix, fig. 10 416-417 



Dalmaniten (Odontocephahis) cegeria, Hall? sp., 1861, pi. x, figs. 4 a-c 417-418 



FOSSILS OF THE HAMILTON GROUP. 



Protozoa 419 



Spongice 419 



Aatrwospongia, Roemer, 1854 419 



A. hamiltonensis, M. & W., 1806, pi. x, fig. 6 419 



Jtadiata 420 



Zoophyta 420 



Microcydvs* n. g., M. &, W., 18(56 420 



M. discus, n. s., M. & W., 1868, pi. xi, figs. 7 a, 6 420^21 



Echinodertnata 421 



Taxocrinus. Pbillips, 1843 421 



T. graciiin, M. & W., 1865, page 421, fig. — , and pi. siii, fig. 3 421-423 



Mollusca 423 



Brachiopoda 423 



OrtW«, Dalman, 1827 423 



O. wc/drlani. Meek, 18G8, pi. xiii, figs. lOa-ti 423-424 



O. iowenis var. furnarius. Hall, pi. xiii, figs. 9 a, 6 424-425 



Strophomena, Raf , 1820 426 



S. rhombuidalis. M'ahleuib., sp., 1821, pi. x, fig. 7 a, 6 426-427 



Tropidi)lei)tus, Hall, 1857 427 



T. carinatus, Conrad, sp., 1839, pi. xiii, figs. 2 Or-c 427-428 



Pentamerus, Sowerby, 1813 428 



P. comis, Owen ? sp., 1855, pi. xiii, figs. 6 a-c 428-429 



P. mbglobosus, n. s., M. & \V., 1808, pi. xiii, figs. 5 a-c 429-430 



Atrypa, Dalman, 1^27 430 



A. aspera, Sclilotbi'im, up., 1813, pi. xiii, figs. 7 a-d . 439-431 



A. reticularis, Linna-us, sp., 1767, pi. xiii, fig. 11 432-433 



/Spm/er, Sowerby, 1815 433 



Subgenus Trigonotreta. Ko-nig, 1825 433 



S. fornacidn. Hall. 1857, pi. xiii, fics. 8 a-c 433^34 



5. subundiferus, n. s., M. & "W., 1868, pi. x, fig. 5 o-e 434-435 



Oi/r«ina, Davidson, 18.58 436 



O. triijuetra, Hall, sp , 1858, jd. xiii, fig. 4 a-d 436 



Lingula. Bruguiere, 1702 437 



L. subspatulnta, u. s., M. & W.. 1868, pi. xiii, fig. 1 437 



LamelKhranchiata 437 



Pterincu, G<ddf., 1832 437 



P.? stthpapyrncea, M. <fc \V., 1806, pi. xi. fig. 5 437-438 



Modiolopsis, Hall, 1847 438 



M.? perovata, M. & W., 1865, pi. xi, fig. 2 438-439 



'juiKpos, small; xvx^oi, a circle. 



