114 



Bulletin 15 



424 



Solarium elaboratuin var. in- 



tusum 81 



pi. II, fig. 8. 



gran ulatum 99 



greggi 79 



pi. II, figs. 4, a. 



huppertzi var 79 



pi. II, fig. 3. 



leanum 81 



pi. II, fig. 6. 



ornatum 397 



scrobiculatum 82 



sylvcerupis 78 



pi. II, fig. I. 



texanum 78 



tricostatum 99 



triliratum 383 



Solen cf. amphistemma 375 



ensis 398 



Soleniscus rockf ordense 211 



Solenochilus henry villense 211 



rockf ordense 211 



Solenoniya vetusta 202 



Spathella typica 147, 202 



Sphenopterinm enorme 140 



Sphenoptus flavins 202 



valvulus 1 47 



Spirialis choFlavensis 103 



pi. 12, fig. 25. 



elongatoidea 103 



pi. 12, fig. 25. 



Spirifer acuminatus 138, 139 



142, 145, 150, 152, 154. 193 



angustus 1 93 



ar6lisegmentvis...i45, 152, 193 



audaculns 193 



byrnesi 145, 146, 149 



150, 155. 154, 193 



consobrinus 1 50 



davisi 142, 149. I55, i93 



de pressus 1 96 



divaricatus 153, 193 



duodenarius 1 93 



euruteines 142, 144, 145 



148, 150, 152, 193 



fimbriatus 155, 193 



fornaculus...i42, 149, 155, 194 



granulifems 143, 148, 149 



granulosus 146, 148 



149 150, 194 



gregarius 148, 149 



150, 152, 154, 194 



grieri 143, 194 



hobbsi 1 94 



keokuk 141, 143, 144 



147, 153, 160, 194 

 iowensis 142, 143 



144, 149, 154, 194 



lateralis 160, 194 



macconathei 1 94 



manni 194 



marionensis 143, 146 



156, 157, 159. 195 



mortonanus 141, 156 



157, 161, 195 



mucronatus 195 



oweni 145, 149. I53 



pennatus 143, 150 



pseudolineatus 147 



raricostus 1 54 



rostellatus 1 95 



segmentus 144, 145 



148, 153, 155, 195 



semiplicatus 140 



subattenuatum 153 



subelliptica 159 



suborbicularis 1 47 



156, 157, 161 



tehuispinatus 1 47 



tuUius 195 



varicosus 138, 139, 141 



142, 145, 146, 149 



153. 154, 155. 191 



ventricosus 142 



Spiriferina depressa..i4i, 144, 147 



solidirostris 143, 146, 196 



subelliptica 161, 1 96 



Spirigera biloba 1 40 



Spirophy ton crassum 148 



Spisula dodona 373 



Spondulus bostrychites var. 



chipolanus 372 , 375 



Sporangites radiatus 215 



Stampien period. The 341 



Stidlopora elegantula.282, 288, 289 



gilberti 184 



ovatipora 184 



vermicula 1 84 



StraparoUus hippolyte 255 



parva 255 



pi. 15, figs. 10, II. 



spirorbis 208 



lens 207 



Streblopteris gracilis 1 44 



media 144, 202 



Strepsidiira 46 



Streptelasma coar6tatum 173 



corniculuni 287, 288, 289 



