WRITINGS OF F. B. MEEK AND A. H. WORTHEN. 43 



Page 

 Palacchinida', McCoy. 

 Archaeocidarida;, McCoj% 



J'alaechinus, McCoy. 1844 22S 



P. hurlingtonensis, M. & W., 1860, pi. xvi, flgs. 3 a-c, and flg. 23, p. 231 230-2» 



Mollusca. 

 LamcllibrancJdata. 



Aviculopecten, McCoy, 1851 231 



A. hurlingtonensis, M. & W., 18G0, pi. xvi, flgs. \a,h 231-232 



INVEUTKBEATK FOSSILS OF THE KEOKUK GROUP. 



Protozoa. 

 SpongicB. 

 Petrospongia. 



Sphenopoterium, M..&W., 18G0 233 



S. obtusum, M. & W., 1860, pi. xvii, flgs. 2 ad (by error a on pi.), 2 e 233 



S. compressum, M. & W., 1860, pi. xvii, flgs. 1 a-e 234 



Madihta. 

 Hchinodermata. 

 Crinoidea. 



Cijathocnrms, MiWcT, 1821 234 



a angulatus, M. & W., 1860, pi. xvii, flg. 4 234-236 



C. safordi, M. & W., 1860, pi. xvii, flgs. 5 a and 6, and fig. 24, p. 237 _. . 236-237 



Potcriocrinus, Miller 237 



Subgenus Scaphiocrinus, Hall, 1858 237 



P. (Scaphiocrinus) decadactylus, M. & "W"., 1860, pi. xvii, fig. 6 aud fig. 25, p. 240 238-240 



Zeacrinus. Troost 240 



Z. plan'tbrachiatus, M. & "W., 1860, pi. xviii, fig. 5 240-241 



Onyehoerinns, Lyon & Casseday, 1859 242-244 



O. monroensis. M. &, W., 1861, pi. xvii, fig. 7 244-245 



O. norwoodi, M. & W., 1860, pi. xvii, fig. 3, and fig. 26, p. 247 245-247 



Echinoidea. ^ 



Perischoechinidce. 



*Oligoporus, M. & W., 1860 l 247 



Melonites multipora, flg. 27 248 



OUgoporus dance, M. & W., 1860, pi. xvii, flg. 8 and flg. 28, p. 248 248-251 



Mollusca. 



Brachiopoda. 



Gamarophoria, King, 1844. 



C subtrigunia, M. & W., I860, pi. xviii, flgs. 8 a-c 251-253 



Chonetes, Fischer, 1837. 



G. planumhona, M. & "W., 1860, pi. xviii, figs. 1 a-d 253-254 



Athyris, McCoy, 1844. 



A. planosulcata, Phillips? (sp.), 1836, pi. xxii, figs. 8 a-d 254-255 



Lamellibranchiata. 



Aviculopecten, McCoy, 1851 256 



A. oweni, M. & W., 1860, pi. xviii, flgs. 2 a-c 256 



A. amplus, M. & W., I860, pi. xviii, flgs. 4 a-c 257-258 



A. ohlongus, M. & W., 1860, pi. xviii, flgs. 3a and 6 258-2.59 



Gasteropoda 



Pleurotomaria, Defrance, 1826 260 



P. shumardi, M. & W., 1860, pi. xviii, flgs. 6a and 6 260-261 



INVERTEBRATE FOSSILS OF THE ST. LOUIS GROUP. 



Protozoa. 

 Spongice. 

 Petrospongia. 



Sphenopoterium, M. & W. 



S. cuneaturn, M. & W., 1860, pi. xix, flgs. 1 o-d 262-263 



Madiata. 

 Echinodermata. 

 Grinoidea. 

 Diehocrinus, Munster. 



D. constrictus, M. & W., 1860, pi. xix, figs. 2 a-c 263-264 



Platycrinus, Miller, 1821 264 



P. prattenanus, M. & "W., 1860, pi. xx, fig. 2 264-265 



* 'oAivoj, few ; nopos, a passage. 



