194 BULLETIN NO. 30, UNITED STATES NATIONAL M TSEUM. 



Page. 

 Latnellibra7ichiata. 



Pterinea, GoUlfuss 165 



P./a6eiJa,Coiira(l,sp. 1842,pl.xv, flg. 12; pi. v, fig. 6 ICJ 



P. newarkemig, n. s., Walcott, 1884, pi. v, flg. 12 165-160 



Actinfqjtcria, Hall 166 



A.boydi,ConTa(\,sp., 1842, pl.v, flg. 2 166 



Leiopteria, Ilall, 1883, pi. v, figs. 10, 10 a 166 



L.rafinesquii, Hall, 1883, pi. v, figs. 10, 10 a 106 



Leptodesma, Hall 167 



L. transversa, n. s., "Walcott, 1884, pi. v, fig. 13 167 



Zimoptera, Hall 107 



L. sarmenticia, ii. s., Walcott, 1884, pi. v, figs. 3, .T a, 6 167-108 



Mytilarca, Hall 168 



Jf. dw/na, n. s.,Walcott, 1884, pl.iv, flg. 5 108 



M. chevmngensis, Conrad, 1842, pi. iv, fig. 9 168-109 



Subgenus I'lethomytilus, Hall 169 



M. (Plethomytilus) ovi/ormis, Conrad, 1842, pi. v, flg. 11 109 



Modiomorpha, Hall 109 



Jf. aifj/orwe, n. s., "Walcott, 1884, pi. V, fig. 9 169-170 



M. ohlonga, n. .s., Walcott, 1884, pL v, fig. 7 170 



If. o6<Msa,n..'*., "Walcott, 1884, pi. iv, figs. 8, 8 a. 171 



Goniophora, Phillips 171 



G. perangulata, Hall, 1870, pi. xv, fig. 10 171 



Nucula, Lamarck 172 



N. rescuensis, n. .s., Walcott, 1884, pi. xv, flg. 9 172 



Nucnla,s\).? Walcott,1884 172 



Dystactella, Hall 172 



Z>.msM«am,n.s., Walcott, 1884, pi. XV, flg. 8 172,173 



Megamhonia, Hall 173 



M. occidnalis, n. s., Walcott, 1884, pi. v, flg. 1 173 



Nyassa, Hall 173 



iV.^orrrt, U.S., Walcott, 1884,pl. XV, flgs. 14, 14 a 173,174 



Grammysia, De "Vemeuil 174 



G. minor, n. s., Walcott, 1884, pi. xv, flgs. 15, 15 « 174-175 



SanguinoUtes, McCoy 175 



S.? cowb€?i6)s,n.,s., Walcott, 1884, pi. XV, flg. 16 175 



S.? orraci7ts,n..s., Walcott, 1884, pi. iv, fig. 10 175-176 



S. rigidnis, White & Whitfield, 1862, pi. xvi, fig. 6 176 



S. ? sanduskyemis, Meek, 1871, pi. v, flg. 4 176-177 



S. ventricosus, White &. Whitfield, sp., 1862, pi. xv, fig. 13 177 



Conocardiiim, Brown 177 



0.w?'rtdc«m,n.s., Walcott, 18S4, pi. xvi, fig.s. 4, 4 a 177-178 



Paracyrlas, Hall 178 



P. Occident alis,U. & W., 1872 178 



Posidonomya, Bronn 178 



P.lceviK, U.S., Walcott, 1884, pi. iv, flg. 6 178-179 



P. dero»Mca, n. i^.. W.alcott, 1884, pl.iv, fig. 7 179-180 



Microdon, Conrad 180 



Subgenus Cupricardella, Hall 180 



M. (Gypricnrdella) macrostriritvs,n. s., Walcott, 1884, pi. v, fig. 5 380 



Anodontopsis, McCoy 180 



A. awygdalrcformis, n. s., W.alcott, 1884, pi. xv, flgs. 1,1 a,h 180-181 



Schizudus, King 181 



Subgenus Ci/?//ero(io»), Hall 181 



.S'. (Cytlierodon) orhicvlarijs, n. s., Walcott, 1884, pi. v, figs. 8, 8 a 181 



Cypricardinia, Hall 182 



C.i'ndcmta, Conrad, sp., 1842, pi. V, flg. 14; pi. xv, flg. 11 182 



Gasti-rnpnda. 



Plntyceras, Conrad 182 



P. conradi. n. s., Walcott, 1884, pi. xvi, flgs. 1,1a 182-1 83 



P. nodosum, Conrad, 1841. j)!. vi, flgs. 5, 5 a, 6 183 



P. nndidatum, n. s., Walcott, 1884, pi. vi, flgs. 2, 2 a 184 



7'. thetiforme, n. s., Walcott, 1884, jil. vi, figs. 4, 4 a, 6 184 



I'latyostottia, Conrad 185 



P. lineatum. Coj\va.(\, 1842 185 



