WRITINGS OF C. D. WALCOTT. 189 



Pagp. 



Summary of results X-9 



Fossils of the Cambrian 11-64 



Observal ions ou Olenellus liowelli 32-39 



Fossils of the Lower Silurian 65-98 



Fossils of tliL' Devonian 99-211 



Fossils of the Carboniferous 212-207 



Systematic list of species 268-281 



Paleozoic section in Central Xevada 283-285 



Index 287-298 



FOSSILS OF THK CAMBRIAN. 



Prospect Mountain Group. 



Porifera. 



Frotaspongia, Salter H 



P. fenestrata, Salter, 1864, pi. ix, figs. 5, 5 a, 6 11-12 



Brachiopoda. 



Lingnlepig, HiiM 12 



L. mcera, H. &W.. 1877 12-13 



L.? minuta, H. & W., 1877 13 



Lingula, Bruguidre 13 



L.? manticula. White, 1S74, pi. ix, figs. 3 and pi. xi, flg. 2 13-14 



Obolella, Billings 14 



O. discoidea, H. &"\V ., 1877 14 



Acrothele, Linnarsson 14 



A.? diehotoma, n. s., Walcott, 1884, pi. ix, flg. 11 14-15 



Scenella, Billings 15 



S. ? conula, n. s., Walcott, 1884, pi. ix, fig. 6 15-16 



Acrotrcta, Kutorga 16-17 



A. gemma, Billings, 1865, pi. 1, figs. 1 (i, 1 6, 1 d-f; pi. ix, figs. 9, 9a 17-18 



Kutorgina, Billings 18 



J\. whilfieldi, n. s., Walcott, 1884, pi. ix, figs. 4, 4 a 18-19 



K. prosjjectennis, n. s., Walcott, 1884, pi. ix, figs. 1 a,b 19 



K.sculptUis, Meek sp., 1873, pi. i, figs. 7, Ta,b; pi. ix, fig. 7 20-21 



Leptmna, Dalinan 22 



L. melita, H. & W., 1877 22 



Orthis, Dalman 22 



O. eurekensis, n. s., Walcott, 1884, pi. ix, figs. 8, 8 a 22-23 



Pteropoda. 



Stenotheca , Salter 23 



S. elongata. n. s., Walcott, 1884, pi. ix, figs. 2, 2 a 23 



Hyolithes, EichwaWl 23 



S.primordialis, Hall sp., 1861 23-24 



Pcecilopoda. 



Agnostus, Brongniart 24 



A. richmondensis, n. s., Walcott, 1884, pi. ix, flg. 10 24-25 



A. seclusus, n. s., Walcott, 18S4, pi. ix, flg. 14 25 



A. bidens. Meek, 1873, pi. ix, figs. 13, 13 a 26,27 



A. communis, 11. & W., 1877 27 



A. neon, H. & W., 1877 27 



A.prnlongus, H. & W., 1877 28 



Olenellus, B.a.n 28 



O.iddingsi, n. s., Walcott, 1884, pi. ix, fig. 12 28 



O.gilberli, Meek, MSS., 1874, pi. ix, fig.s. 16, 10 a,- pL xxi, flg. 13 29 



O.howelU, Meek, MSS., 1871, pi. ix, figs, l.'i, 15 a, b, and pi. xxi, figs. 1-9 30-31 



Obsf r\-alions on Olenellus howe.Ui, pi. xxi, figs. 1-7 32-39 



I>icelloce2)halus, Ovreu 40 



i>.6i7o6a<MS, H. (fc W.. 1877 40 



I).osceola,na\l. 1863, pi. ix, fig. 25 40 



D. nasuti'.s, n. s., Walcott, 1884, pi. x, flg. 15 40-41 



B. richmondensis, u. s., Walcott, 1884, pi. x, flg. 7 41-42 



D. ? angusti/rons, n. .s., Walcott, 1884, i)l. x, figs. 1, 1 a, & 42^3 



Z).io2c, n.s.. Walcott, 1884, pi. X, iig. 19 43-44 



D.manca, n. s , Walcott, 1884. pi. x, flg. 13 44-45 



£>.? quadriceps, H. & W., 1879, pl.ix, flg. 24 45 



