INDEXICAL LIST OF FOSSILS. 



255 



Nucleospira pisiformis, II, 94. 

 Nucula kazanensis, II, 122. 



Syn. Nuculana bellistriata. 

 Nucula parva, II, 121. 

 Nucula ventricosa, II, 121. 

 Nuculana bellistriata, il, 122. 



Oligoporus danse, I, 126. 

 Oligoporus mutatus, I, 126. 

 Oligoporus par vu3, 1, 127. 

 Ollacrinus typus, I, 164 



syn. Gilberstocrinus typus. 

 Omphalotrocbus springvalensis, II, 



162. 



Onychaster asper, I, 131. 

 Onycbocrinus monroensis, I, 224. 

 Opbileta compacta, II, 162. 

 Oracantbus consimilis, II, 238. 



Syn. Oracanthus vetustus. 

 Oracanthus vestustus, II, 238. 

 Orbicula nitida, II, 39. 



Syn. Discina nitida. 

 Orophocrinus campanulatus, 1, 142. 

 Orophocrinua stelliformis, I, 141. 

 Orophocrinus stelliformis, var. 

 carnpanulatus, 1, 142. 



Syn. Orthis campanulatus. 

 Orthis acutilirata, II, 66. 



Syn. Platystrophia acutilirata. 

 Orthis burlingtonensis, II, 63. 

 Ortbis carbonaria, II, 64. 



Syn. Orthis pecosii. 

 Orthis clarkensis, II, 63. 



Syn. Orthis s wallowi. 

 Orthis cooperensis, II, 64. 



Syn. Orthis dubia. 

 Orthis crenistria, II, 68. 



Syn. Streptorhynchus crenistria. 

 Orthis dubia, II, 64. 

 Orthis emacerata, II, 58. 

 Orthis fiesicosta, II, 57. 

 Orthis iowensis, II, 62. 

 Orthis keokuk, 11,63. 

 Orthis lasallensis, II, 67. 



Syn. Streptorhynchus crenistria. 

 Orthis lynx, II, 64. 



Syn. Platystrophia lynx. 

 Orthis michelina var. burlington- 

 ensis, II, 63. 



Syn. Orthis burlingtonensis. 



Orthis missouriensis, II, 63. 



Syn. Orthis burlingtonensis. 

 Orthis occidental, II, 57. 

 Orthis pecosii, II, 64. 

 Orthis pratteni, II, 106. 



Doubtful. 

 Orthis richmonda, II, 68. 



Syn. Streptorhynchus crenistria. 

 Orthis striatocostata, II, 69. 



Syn. Meekella striatocostata. 

 Orthis subcarinata, II, 62. 

 Orthis subquadrata, II, 60. 

 Orthis swallowi, II, 63. 

 Orthis thiemei, II, 63. 



Syn. Orthis burlingtonensis. 

 Orthis tricenaria, II, 60. 

 Orthisina crassa, II, 67. 



Syn. Streptorhynchus crenistria . 

 Orthisina missouriensis, II. 68. 



Syn. Meekella striatocostata. 

 Orthisina occidentalis, II, 69. 



Syn. Meekella striatocostata. 

 Orthiaina robusta, 11, 67. 



Syn. Streptorhynchus crenistria. 

 Orthisina shumardiana, II, 68. 



Syn. Meekella striatocostata. 

 Orthoceras arcuoliratum, II, 227. 

 Orthoceras chemungense, II, 228. 



Doubtful. 



Orthoceras chesterense, II, 225. 

 Orthoceras chouteauense, II, 225. 

 Orthoceras colletti, II, 226. 



Syn. Orthoceras occidentale. 

 Orthoceras harii, II, 226. 



Syn. Orthoceras rushense. 

 Orthoceras jolietense, II, 227. 

 Orthoceras medullare, II, 227. 

 Orthoceras occidentale, II, 226. 

 Orthoceras ozarkensis, II, 226. 

 Orthoceras rushense, II, 226. 

 Orthoceras striaelineatum, II, 227. 



Syn. Orthoceras medullare. 

 Orthonychia acutirostre, II, 190. 

 Orthonychia boonvillense, I, 189. 

 Orthonychia chesterense, II, 191. 

 Orthonychia cyrtolites, II, 188.: 

 Orthonychia formosum, II, 189. 

 Orthonychia spirale, It, 188. 

 Orthopleurodus carbonarius, II, 234. 



