502 GENERAL INDEX 



O 



Okaw formation 27 



Orbiculoidea, d'Orbigny 39 



Orbiculoidea batesvillensis Weller 42, I 



O. capax (White) 39, I 



O. keokuk (Gurley) 41, I 



O. sampsoni (Miller) 40, I 



O. varsoviensis (Worthen) 41, I 



Orthidae 147 



Orthis burlingtonensis 149 



O. cooperensis 160 



O. crenistria 75 



0. duMa 160 



O. inegualis 61 



0. Jcaskaskiensis 77 



0. JceokuJc 75 



0. michelini 151 



O. michelini var. burlingtonensis..... 149 



O. missouriensis 148 



O. resupinata 167 



0. subellip tica ; 162 



0. swallovi .1 167 



O, theimei 155 



O. umbraculum 70 



O. (Rhipidomella) burlingtonensis 149 



O. (R. ) Oweni 151 



Orthotetes, Fischer de Waldheim 74 



Orthotetes kaskaskiensis (McChesney) 77, VI 



O. keokuk (Hall) 75, VII 



Orthothetes inwqualis 61 



0. inflatus 59 



O. lens 55 



0. minutus 70, 71 



O. rubra 54, 56 



O- sp 65 



Osage group 16 



P 



Paint Creek formation 26 



Palestine formation 29 



Paraphorhynchus elongatum 191 



P. gibbosum 221 



P. ovatum 208 



P. striatocostatum 189 



P. transversum 188 



Paryphorhynchus, Weller 187 



Paryphorhynchus elongatum Weller 191, XXVI 



P. striaticostatum ( Meek and Worthen) 189, XXVI 



P. transversum Weller 188, XXVI 



Pentameridse 169 



Pentamerus lenticularis _ 459 



Plectambonites rhomboidalis 49 



Producta analoga 49 



p. arcuata. ~ 107 



P. concentrica 98 



P. parvula _ 128 



P. cooperensis 98 



Productidae 78 



Productella, Hall 97 



Productella arcuata 107 



P. concentrica (Hall) 98, XIX 



P. cooperensis 98 



P. nummularis (Winchell) 101, XIX 



P. pyxidata Hall 100, XIX 



P shv.mard Inna 98 



P. sublsevis n. sp 102, LXXXIII 



