56 BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Pag*>. 



MoUuaca 335 



Brachiopoda 335 



Strophomena, Rafinesqiip, 1820/ 335 



S.unu:ostata,Ti.>i., il. &. W., 18G8, pi. iv, figs. 11 o, 6 335-337 



LameUibratichiata 337 



J^jnftimyc/iia. Hall, 1847 337 



Subgenus Megaptera, M. it W., 1866 337 



Mc'japtera ca«ei, M. & W., 1866, pi. iv, figs. 9 a, 6 337-338 



I>oto6ra, McCoy, 1844 .» 339 



D. sterlingensis, 11. A: "NV., 1866, pi. iv, figs. 10 a, &, c 33&-340 



Gasteropoda 340 



Cyrtoliteg, Conrad, 1^38 340 



O. imbricatus, n. s., M. & "W"., 1868, pi. iv, fig. 12 340-341 



Pteropoda 341 



Tentaculites, Schlotbeini, 1820 341 



T. tenuiitriatus, M. & W., 1865, pi. iv, figs. 7 a,h 341-342 



T. oswegoejisis.'hl. &. W., 186.5, pi. iv, fig. 6 a 342-343 



T. sterlingensis,M. &,Vt'., 1865, pi. iv, fig. 8 343 



UprEu Silurian Species. 



FOSSILS OF TIIK NIAGAUA GROUP. 



Protozoa ' 344 



Spongice 344 



Astylospongia, RoBmer 344 



A. U christiani, n. s., M. & W., 1868, pi. v, figs. 3a,b,c 344-345 



Pasceolug, Billings, 1853 345 



P. ? dactylioides, wen, sp., 1844, pi. v, figs. 2a,b.c _ 345-346 



Eadiata 347 



Eehinodermala 347 



Saccocrinus, Hall, 1852 347 



/S. c/im<i/i", Hall? .sp., 1863, pi. v, fig. 1 347-349 



Mollusca 349 



Brachiopoda 349 



Hern,ipr(>nites,'Pa.nAf:T. 1830 349 



H.subplanui,Co-ar'AA'i sp., 1842, pi. vi, figs 6 a, 6 349-351. 



Ofcoius, Eichwald, 1829 351 



O. {Triinerella\] cofiradi. Hall, 1868, pi. v, figs. 7 a, i. 351-3.52 



Centronella, Billiugs, 1859 , 3.12 



C. billingsiana, n. s., M. & W., 1868, , p. 352, figs, a-c, and pi. vi, figs. 5 a-c 352-353 



MerUtella, Hall, 1860 354 



Merixtella ? sp., pi. vi, figs. 4 a, ^ 354 



Lamellibranckiata 354 



Pterinea, Goldfuss, 1832 354 



P. thebesensis, u. s., M. & W., 1868, page 354, fig. — , and pi. vi, fig. 3 354-355 



Atnbonychia, Hall, 1847 356 



A. acutiroKlris, Hall ? 1865, pi. v, figs. 8 a, b, and 9 c 356-357 



Amphicaelia, Hall, 1864 357-358 



A. neglecta, McCheney, 1861, pi. v, figs. 9 a,b (not c) 358-359 



Gasteropoda 359 



Pleuroto7naria,T)etraDCC, 1824 359 



P. ca«u.n. 8.,M. & W., 1868, pi. v, fig. 5 359-360 



P. cyclonemoides, n. s., M. & "W., 1868, pi. v, fig. 4 360-361 



Hiibulites (Conrad), Emmons, 1842 361-362 



S. (Poh/phemopsu) brevis, Winchell &. Marcy, 1805, ])1. v, fig. 6 352-363 



Articulata 363 



Crustacea 363 



Dalmanites, Auct 363 



D. dance, M. &"W., 1865, pi. vi, fig. 1 a-/ 363-367 



FOSSILS OF THE I.OWEK HELDEHUEllO GROUP. 



Hadiata 368 



Zoopkyta 368 



5<ri<l^>pora, Hall, 1852 368-369 



S. inissoiiriensis, n. 8.,M. &. TV., 1868, pi. vii.flg. 4 369-370 



Echinodermata 370 



