WRITINGS OF F. B. WEEK AND A. H. WORTHEN. 81 



Page. 



JBellerophon, MojittoH,lS08 222 



5. newberryi, Meek, 1871, pi. XX, fig. 5, and fig. —, p. 223 222-225 



B. patulus, Hull, &g.—, -p. 22S 223 



B. propinquug. Meek, 1871, pi. xx, figs. 4 a-b 226 



Pleurotoviaria, Defrance, 1826 226 



P. Zwcina, Hall.i', 18C2, pi. XX, fig. 6 226-227 



Co7miarta, Miller, 1818, MS 228 



O. eUgantula, Meek, 1871, pi. xxiii, fig. 4 228-229 



Cephalopoda. 



0,i/rtocera«i«c«, Goldfuss, 1830 ? 229 



C. oAioenm, Meek, 1871, pi. xxiii, figs. 2 and 2 b 229-230 



OyroceratUefi, Meyer, 1831 230 



O. (? Trochoceras) ohioensis, Meek, 1871. pi. xxii 230-231 



O. [9 Nautilus) inelegangyMeek., pi. xxi 232 



Articulata. 

 Crustacea. 



Proefu*, Steininger, 1831 233 



P. planimarginatus, Meek, 1871, pL xxiii, figs. 3 a,b 233-234 



DalmanUes, Bairande, 1852 234 



D. ohioensis. Meek, 1871, pi. xxiii, fig. 1 234-236 



91. 



Meek, F. B., and Wokthen, A. H. Paleontology. Descriptions of Invertebrates from 

 the Carboniferous System. ^Geological Survey of Illinois, vol. v, pp. 32li-619, 

 pis. i-xxxii. 1873. Springfield, 1873. 



Published by authority of the legislature of Illinois, 1873. 

 Genera Phyaetocrinus, Nipterocrinus, Uodonites. 



LowEu Cauboniferous Sfecies. 



FOSSILS OF THE BURLINGTON GROUP. 



Page. 

 Echinodermata 323 



Notes on the structure and habits of the Palaeozoic Crinoidea 323 



Synbathocrinvs, Phillips 324 



Ooniasteroidorrinus, Lyon & Casseday 324-325 



Cyathocrinus, Miller 325-327 



Convoluted support of the digestive sack in the Actinocrinidce 327-329 



Ambulacral canals passing under the vault in the Actinocrinidai 329-339 



Actmocrinitss, Miller 339-341 



Actinocrinites. Section (a) 342 



A.penicillus, M. & W., 1869, pi. viii, fig. 2 342-343 



A. sculptus. Hall, 1858, pi. iv, fig. 2 343 



A. delicatus, M. & W., 1869, pi. viii, flg. 2 343-345 



Actinocrinites. Section (6) 345 



A. longus, M. & W., 1869, pi. viii, fig. 1 345-347 



Slrotocrinus, M. & W., 1866 347-349 



S.? asperrimus, M. & W., 1869, pi. viii, fig. 3 349-351 



Subgenus Physetoerinus, M. & W 351 



S. (Physetoerinus ?) asper, M. &. W., 1869, pi. vii, fig. 1. Section (b), p. 253 351-353 



S. ectypus, M. &.W., 1869, pi. vii, fig. 5 353-355 



S. Uratus, Hall, sp., 1860, pi. vii, flg. 2 3.55-357 



S. perumhrosiis. Hall, sp., 1860, pi. viii, fig. 4 357-360 



S. umbrosus. Hall, sp., 1858, pi. viii, fig. 5 360-362 



S. (Physetocri7ius) dilatatus, M. & W., 1869, pi. x. fig. 6 363-364 



Batocrinus, Casseday 364-368 



B.quasillus, M. & W., 1869, pi. v, flg. 2 369-370 



B. (Eretmocriniis) remibrachialus, Hall's sp., 1861, pi. x, flg. 5 370 



B. cassedayanus, M. & "W., 1868, pi. v, fig. 1 370-372 



B. troehiscus, M. &, W., 1868, pi. v, flg. 6 372-374 



B. pyrifornds, Sliumard sji. , 1855, pi. v. flg. 5 375-377 



B. {EretmocrinuK O neglectus, M. &.W., 1868, pi. v, fig. 3 377-379 



B.rhristyi, Shunjaid's sp., pi. v, flg. 4 . . .,, 37a. 



J20— Bull. 30 6 



