496 INDEX 



Crepicephalus — Continued. page 



genotype. Dikelocephaliis ? ioweiisis Owen 201 



geographic distribution 203 



observations 203 



pygidia compared 201 



species referred to 203 



stratigraphic range 202 



synonymy 199 



augusta Walcott, described 204 



figured, pi. 29, figs. 6, 6a-h 240 



characterized 201 



compared with Crepicephalus nnzia 217 



formation and locality 205 



listed 203 



stratigraphic range 202 



synonymy 204 



camiro, new species, described 205 



figured, pi. 32, figs. 2. 20 246 



characterized 201 



compared with Crepicephalus iowensis 205 



Crepicephalus sp. undt. (2) 219 



formation and locality 205 



listed 203 



stratigraphic range 202 



centralis Whitfield, referred to Aiionwcarella 204 



comus, new species, described 205 



figured, pi. 31, figs. 2,. ?,a 244 



characterized 201 



compared with Crepicephalus ihoosa and C. tiiiiiidus 205 



formation and locality 205 



listed 203 



stratigraphic range 202 



convexus, characterized 201 



listed 203 



stratigraphic and geographic position 47, 202 



coosensis, new species, described 206 



figured, pi. 32, figs. 3, 3a-/ 246 



associated fauna 206 



characterized 201 



compared with Crepicephalus iowensis 206 



Crepicephalus upis 218 



formation and locality 206 



listed , 203 



stratigraphic range 202 



coria, new species, described 206 



figured, pi. 33, figs. 3, 3a-g 248 



associated with Crepicephalus dis 207 



characterized 201 



