INDEX OF GENERA AND SPECIES. 



311 



Pago. 



Planorbis(Bathjomphalus) amplexus. 100, 161,169 



kanabenais.137, 169 



plano-convesus . . 106, 



161, 109 



cirxatus 159, 170 



convolutus 16, 106, 101, 169 



var 106 



fragilia IT 



(Gyraulus) militaris 153, 170 



leidyi 31, 107,170 



lunata 170 



(Menetu.s) nebrascensis 107 



vetustus 107 



nebrascensis 170 



spectabilis 33, 95, 112 



var. utahensis 95, 112 



subumbilicatus 16 



tenuivolvis 17 



utahensis 33, 135, 170 



var. spectabUis 170 



vetemus 34, 167 



vetulns 31 



vetustus 170 



PlantoB 128,259,261 



Planularia cuneata 47 



Platyceraa 40,57, 59, 60, 74, 80, 84, 86, 90, 117, 



132, 149, 165, 178, 186, 194, 197 



attenuatum 67 



biserialis 60 



bivalve 117 



conradi 194 



dnmosum var. attenuatum 80 



equilatera 84, 149 



flssurella 84 



haliotoides 40, 59 



infundibnlum 84 



Isevigatum 40 



minutissimom 186 



mnltispinosnm 67, 80 



nebrascense 132, 179 



nebrascensis 74 



nodosum 194 



occidens 197 



(Orthonychia) chesterense 40 



Infundibulom . . . 40 



lodiense 67,89 



pyramidatum ... 57 



qnincy ense 60 



subplicatom 40, 59 



paralium 117 



piso 197 



[?] reversum 60 



spinigernm 86 



spirale 57 



subundatum 57 



thetiforme 194 



tortum 67,90 



tribulosum 165 



uncum 40, 84 



undulatum ■ 194 



ventricosum 59 



Pla( ycbisma depressum . . » 226 



oculus 226 



rotundatum 226 



Platy crinites 82, 83, 85 



' P.ige. 



I'lalycrinitcs ir-qualis 82 



bialiiigtoneusis 82 



(Eucladocrinus) montanaensis 71 



halli 82 



hpmi.sphoricii8 83 



incoinptus 83 



planus 82 



parvulus 85 



subspinosus 82 



tenuibrancblatus 8H 



Platycrinus .23, 26, 38, 42, 43, 59, 60, 117, 118, 127, 130, 

 144, 154, 103, 165, 248, 249, 250,251 



'I 127,130 



amerioamis 349, 251 



bonoen.sis 144, 165 



builingtonensis 349, 251 



corrugatus 349, 251 



discoideus 349, 251 



haydeni 163 



liemisphaericus 38, 60, 154 



iucomptus 117 



multibranchiatus 36 



niotensia 38, 60 



owcni 36 



l>arvulus 38 



peuicillus 33, 44 



planus 44, 59, 349, 251 



plenus 33 



(Pleurocrinus) asper 36, 59 



subspinosus 42 



pleurovimensia 118 



prattenanus '. 33,43 



quinquenodus 118 



scobina , 36, 59 



verrucosus 117 



yandeUii 349, 251 



Platyostoma 25,80,148,194,197 



Inornatum 197 



lineatum 194 



nana 35, 27 



niagarense 148 



var. trigonostonia . . 80 



? trigonostoma 67 



Humida 35 



Platyclilsma 195 



? ambignum 195 



? depressum 333 



? mccoyi 195 



pelicoides 40 



Platy trochus goldfassii 220 



stokesii 220 



Plectosolen ? diegoensis 220 



parallelus 220 



Plethomytilus 194 



Pleurocrinus 38,42 



Pleurodictyum 57 



problematicum 57 



Pleurolimna3a 106, 161 



Pleuromya 260,262 



newtoni 360,262 



Pleurophorus.32, 33, 38,' 45, 61, 73, 86, 90, 151, 197, 258 



? 92 



? angulatns 38,92 



calhouni 33 



? (cardinia) snbcuneata 19 



