WRITINGS OF F. B. MEEK AND A. 11. WORTHEN. 91 



LOWER SILURIAN SPECIES. 



Echinodermata. Page. 



Hoinvcrinus, Hall 492 



H. angustatus, M. & W., 1870, pi. xxiii, fig. 8 492-493 



Heterocrinus crassus, M. & W., 1865, pi. sxiii, fig. 1 493 



Mollusca. 

 LameUibranehiata. 



ModiolopsU subnasuta, M. &, W., 1870, pi. xxiii, figs. 9 a, 6 494-495 



Gasteropoda. 



SuhuUtes, Coniad 495 



S. inflaius, M. & W., 1869, pi. xxiii, fig. 5 495-496 



Articulata. 



Asaphus, Brongniart 497 



A. (Isotelm) vigilans, M. & W., 1870, pi. xxiii, tig. 6 497-498 



UPPER SILURIAN SPECIES. 



Spoiigice. 



Astylospongia prcemorsa, Goldf. ? sp., 1826, pi. xxv, figs. 2, 2 a 499 



Foraminifera 1 



EeceptacuUtes, Defrance 500 



R. formosus, M. & "W., 1870, pL xxiv, fig. 1 500 



Brachiopoda. 



Stricklandinia, Billings 502 



S. de/ormis, M.&W., 1870, pL xxiv, figs. 5 a, 6 502-503 



Cephalopoda. 



Orthocerm, Auct 503 



O. crehristriatam, M. & W., 1865, pi. xxvi, fig. 2 503-504 



O. medidlare,^2i\\ ? 1860, pi. xxvi, fig. 1 504 



O. angidatum, Wahl, 1827, pi. xxiv, fig. 8 504 



O. jolieten»U, M. & W., 186-3, pi. xxvi, fig. 5 505 



Cyrtoceras, Goldfuss 506 



C. dardanw*, Hall ? 1861, pi. xxv, fig. 6 506 



Lituites, Breyn 507 



i.Srro/ionen^w, M. &W., 1869, pi. xxv, fig. 1 507-508 



Crustacea. 



Lichas, Dalman 508 



L. boltoni, Bigsby, sp., 1825, pi. xxv, fig. 5 508 



lUaenus, Dalman 508 



/. (Bumastus) gra/tonensis, M. & W., 1869, pi. xxv, fig. 4 508-510 



Sphcerexochus, Bey rich 510 



S. romingeri, Hall, 1862, pi. xxiv, fig. 4 510 



Mollusca. 

 Cephalopoda. 



Phragmoceras 511 



P. waZiVtu, M. & W., 1866, pi. xxviii, figs. 2 o, 6 511-512 



Orthoceras 512 



C.winchelli, M. & W., 1866, pi. xxviii, fig. 1 512-513 



LOWER CARBONIFEROUS SPECIES. 



Echinodermata. 



Synbathocrinus, Phillips 514 



S.robustus, Shumard, 1866, pi. xxix, fig. 4 514 



Dichocrinus, Munster 515 



D. ficus, Casseday &c Lyon, 1860, pi. xxix, fig. 7 515 



Poteriocrinus 516 



Subgenus Scaphiocrinus, Hall 519 



P. (Scaphiocrinus) unicus, Hall, 1861, pi. xxix, fig. 1 519 



Pentremites, Say 521 



P. {Tricoelocrinus), ofeKguattts Kocaner, sp., 1852, pi. xxxi, fig. 4 521 



Spirifer, Sowerby 521 



ii.fastigatus, M. <fc W., 1870, pi. xxx, fig. 3 521-523 



S. neglectus, Hall, 1858, pi. xxx, figs. 2 a, and Ic 523 



S. suborbicularis, Hall, ls58, pi. xxx, fig. 1 523-524 



