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



Page 

 Palacchinidce, McCoy. 

 Ar'chaeocidarida', McCoy. 



ralaecJtinus, McCoy, 1844 22S 



P. hurlingtoncmis, M. & W., 1860, pi. xvi, flgs. 3 a-c, and fig. 23, p. 231 230-23J 



Molluxca. 

 Lavtellibranchiata. 



Aviculopccten, McCoy, 1851 231 



A. burlingtonensis, M. & W., 1860, pi. xvi, flgs. la, & 231-232 



INVEKTKBKATE F0S8I1-S OF THE KEOKUK GROUP. 



Protozoa. 

 Spongice. 

 Petrospongia. 



Sphenopoterium, M. & W. , 1860 233 



aS'. obtiiiium,M. & W.,1860, pi. xvii, figs. 2 a-d (by error a on pi.), 2 c 233 



S. comprcssum, M. &, W., 1860, pi. xvii, flgs. 1 a-c 234 



Padlata. 

 Echinodermata. 

 Crinoidea. 



Cyathocnnus, MiWeT, 1821 234 



C. angulatus, M. & W., 1860, pi. xvii, fig. 4 234-236 



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



Potcriocrinus, Miller 237 



Subgenus Scajjhiucrinus, Hal i, 1858 237 



P. (Scaphiocrinits) dccndactylus, M. & W., 1860, pi. xvii, fig. 6 and fig. 25, p. 240 ... . 238-240 



Zeacrinus. Troost 240 



Z. plawhrachiatus, M. &. W., 1800, pi. xviii, fig. 5 240-241 



Onychocrinus, Ly on & Casseday, 1859 242-244 



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



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



Schinoidea. 

 Perischoechinidce. 



*OUgoporus, M. & W., 1860 247 



Melonites multipora, flg. 27 248 



Oligoporus dance, M. & W., 1800, pi. xvii, flg. 8 and flg. 28, p. 248 248-251 



Mollmca. 

 Braehiopoda. 



Camarophoria, King, 1844. 



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



Ohonetes, Fischer, 1837. 



G. plannmbona, M. & W., 1860, pi. xviii, flgs. la-d 253-254 



Athyris, McCoy, 1844. 



A. planosiilcata. VhUUita^ (sp.), 1836, pi. xxii, flg.s. 8 o-d 254-255 



Lamellibranchiata. 



AvictUopecten, McCoy, 1851 256 



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



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



A. oblungus, M. &, W., 1860, pi. xviii, flgs. 3a and & 258-259 



Oasteropoda 



Pleurotomaria, Defrauce, 1826 260 



■ P. A/iMWiardi, M. & W., 1860, pi. xviii, figs. 6a and 6 260-261 



INVERTEBKATE F088ILB OF THE ST. I.0UI8 GROUP. 



Protozoa. 

 Spongice: 

 Petrospongia. 

 Sphenopoterium, M. & W. 



S. cuneatum, M. & W., 1860, pi. xix, flgs. 1 a-d 262-263 



liadiata. 

 Echinodermata. 

 Crinoidea. 

 Dichocrinus, Munster. 



D. constrictus, M. & W., 1860,pl. xix, flgs. 2a-c 263-264 



Platycrinus, Miller, 1821 264 



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



* 'oAtYo?, few ; nopos, a passage. 



