WRITINGS OF C. D. WALCOTT. 189 



Page. 



Summary of results 1-9 



Fossils of the Cambrian 11-C4 



Observations oii Olenelliis howelli 32-39 



rosailsof the Lower Silurian 65-98 



Fossils of the Devonian j 99-211 



Fossils of the Carboniferous 212-267 



Systematic list of species 268-281 



Paleozoic section in Central Nevada 283-285 



Index 287-298 



FOSSILS OF THE CAMBRIAN. 



Prospect Mountain Group. 



Porifera. 



Protaspongia, Salter 11 



P.fcnestrata, Salter, 1864. pi. ix, figs. 5, 5 a,b 11-12 



Brachiopoda. 



Llwjidepis, Hall 12 



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



LJ minuta, H. & W., 1877 13 



Lingnla, Bruguifere 13 



L.? manticula, White, 1874, jd. ix, fig.s. 3 and pi. xi, fig. 2 13-14 



Obolella, BiWings 14 



O. discoidea, H. &TS'., 1877 14 



Acrothele, Linnarsson 14 



A.? dichotoma, n. s., Walcott, 1884, pi. ix, fig. 11 14-15 



Scenella, Billings 15 



S. ? conula, U.S., "SValcott, 1884, pi. ix, fig. 6 15-16 



Acrotreta, Kutorga 16-17 



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



Kutorgina, Billings 18 



M. whitfleldi, n. s., Walcott, 1884. pi. ix, figs. 4, 4 a 18-19 



K. pros]>cctcniiis, n. s., "Walcott, 1884, pi. ix, figs. 1 a, 6 19 



K. sculptilis, Meek .sp., 1873, pi. i, fig.s. 7, 7 a, 6 ; pi. ix, fig. 7 20-21 



Leplmiia, Dalraan 22 



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



Orthis, Dalraan 22 



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



Pteropoda. 



Stcnotheca , Suitor 23 



S. elongata. n. s., Walcott, 1881, pi. ix, figs. 2, 2 a 23 



Eyolithcs, Eichwald 23 



H. prhnordialis. Hall sp., 1861 23-24 



Poecilopodn. 



Agnostus, Brongniart 24 



A. richmondcnsis. n. s., Walcott, 1884, pi. ix, fig. 10 24-25 



A. seclusus, n. s., Walcott, 18-i4. pi. ix, fig. 14 25 



A. hidens. Meek, 1873, pl.is, fig.s. 13, 13 a 26,27 



A . cninmitnis, It. A W., 1877 27 



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



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



Olenellus,'S.a.\\ 28 



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



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



O.lwwelU, Meek, MSS., 1874, pi. ix, tig.s. 15, 15 a, 6, and pi. xxi, figs. 1-9 30-31 



Obst rvalions on Olenellus howelli, pi. xxi, figs. 1-7 32-39 



DiceUoce2)halus, Owen 40 



D. 6!7o?)a«MS, H. & AV., 1877 40 



D.osceola,iIa]l. 1863, pi. ix, fig. 25 40 



llnasuti'.s, U.S., Walcott, 1884, pi. x, fig. 15 40-41 



D. richmondensin. n. s., Walcott, 1884, pi. x, fig. 7 41-42 



D.r angustifrGns,n.fi., Walcott, 18S4, pi. x, flg>». 1, 1 a,h 42-43 



D.iolc, n. s., Walcott, 1384, pi. x, (ig. 19 43-44 



D.maiica, n. s, Walcott, 1884. pi. x, fig. 13 44-45 



p. l quadriceps, H. & W., 1879, pl.ix, fig. 24 „..,,..,,..,,,..,,„ , 45 



