UO BULLETIN NO. 30, UNITED STATES NATIONAL MUSEUM. 



Pajre. 



D.; eximnstis, n.s., "Walcott, 1884, pi. ix, tig. 19 45-46 



rtyehoparia, Cordii 46 



P. f prus2Jectensis, n.s., "Walcott, 1884, pi. ix, fig. 20 46-47 



r. i linnarmivni. n. 8., Walcott, 1884, pi. ix, lig.s. 18, 18 a 47-48 



P. {Sulenoplcura ?) breviceps, n. s., Walcott, 18S4, pi. x, fig. 9 49 



P. ? pcrnasuli's, u. s., Walcott, 1884, pi. x, tigs. 8, 8 a, 6 49-50 



P. {Euloinal) dixsunilis, n. s.iV.'alcott, 1881, pi. ix, tig. 28 f)! 



P. occidentalis, n.s., Walcott, 1884, pi. x, fig. 5 51-52 



P.similis, U.S., Walcott, 1884, pl.x, fig. 10 52-53 



7'. similis var. robustug, u. var. , Walcott, 1884, pi. i, flga. 9, 9 a 53 



P. (Euloma ?) affinis, n. 8., Walcott, 1884, pi. s, fig. 12 .54 



P.la>vieeps, n.s., Walcott, 1884, pi. x, figs. 17, 18 .54-55 



P.oivcni, M. & II., 1861, pl.x, flga. 3, 3 a 55-56 



P.anytus, II. & W., 1877, pi. ix, fig. 26 56 



P. granulusus, H. & W., 1877 57 



P.hagnci, H. & W., 1877 57 



P.nitidiis, 'EL. &.W., 1877 57-58 



P.unisvlcatits,!!. & W., 1877 .58 



Subgenus Vtcrocrxyhahis, Eu?raer 58 



P. {Ptcrocrphalus) occidens, n. s., Walcott, 1884, pi. ix, fig. 21 58-59 



P. (rternccphalvs) laticrpn, H. & W., 1877 59 



A nomocare, Augelin 59 



J.?;)ari'M)», B. s.. AValeott, 1884, pi. ix, fig. 17 59-60 



Ptychdnpis, Hall 60 



P.minutn, Whitfield? 1878, pl.x, flg.23 60-61 



Chariocephaliis, Hall 61 



C? tumifrojis, II. & W., 1877, pl.x, fig. 16 61 



Agratdos, Conla 61 



A. ? gU>bosv><, U.S., Walcott, ie84, pi. ix, fig. 23 61-62 



Arelhimiana, Barrande 62 



A.americana, U.S., Walcott, 1884, pi. ix, fig. 27 62-63 



Ogygia. I5roni;niart 63 



O. ? .cpinoOT, n. s., Walcott, 1884, pi. ix, fig. 22 63 



O. ? prohlematica, n. s. , Walcott, 1884, pi. x, figs. 2 a, b, and 4 63-64 



FOSSILS OF THE LOWER SILURIAN, 



Pogonip Group. 



Phizopoda. 



Peceptaculiteg Def railce 65 



Ji.mammillaris, MSS., Newberry, 1880, pl.xi, fig.ll 65-66 



P. elongalug, n. s., Walcott, 1884 66-67 



B.eUipticns, n.s., Walcott, 1884, pl.xi, fig. 12 67 



Brack iopoda. 



Obolella, Billings 67 



O. ? ambigua, n.s., Walcott, 1884, pi. i, tigs. 2 a-c 67-C8 



Schizambon, n. g., Walcott, 1884 69-70 



S. typicalis, n. s., Walcott, 1884, pi. i, flga. 3 a-d 70-71 



Strophotnena, IJafiuesiiue 71 



A", nemea. II. & W., 1877 71 



Orthin, Dalmau 72 



O. perveta, Conrad, 1841), pi. xi, figs. 2 a,b 72 



O. testudinaria, Dalmau, 1827, pi. xi, figs. 10, 10 a 72-73 



O. hamburgensig, n. s., Walcott, 1884, pi. xi, flgs. 5, 5 a 73 



O. lonensis, n. s., Walcott, 1884, pi. xi, flgs. 6, 6 a 74 



O. tricenaria, Conrad, 1843, pi. xi, flgs. 4,4 a 74-75 



aireplorhynchus, King 75 



S. minor, n. s., Walcott, 1884, pi. xi, flg. 9.. 75 



Triplegia, Hall 75 



T. calci/era, Billings, 1861, pi. xi, flgs. 7,8 75-76 



LaineUibranchintit. 



TeMinoinya, Hall 76 



T. cuiitracta, Salter? 18.59. pi. xi, flgs. 15,15 a -. 76 



T.f hamburgemis, n. s., Walcott, 1884, pi. xi, tigs. 1, 1 a 76-77 



Modiolopsis, Hall 77 



