380 



INDEX. 



Page, 



obscura, Dekayella 205 



oeilensis, Crisinella 73 



Oldest known Bryozoa 3,10 



Orbignyella 177,181 



expansa 183 



baltica 1S3 



gennana 182 



sublamellosa 182 



Orbipora 178,251 



acanthophora 255 



distincta 252, 253 



fungifonnis 346 



indenta 257 



Orbipora panderi 286 



Orbipora solida 255 



OrUtulites 251 



apiculatus 344 



distinclus 253 



Ordovician formations, Upper Mississippi 



Valley 25 



Ordovician of northeastern Iowa and south- 

 eastern Minnesota, Composite geologic sec- 

 tion of 25 



Ordovician strata, description of 11 



Dictyonema beds, A3 11 



Echinospherites limestone, 



CI 13 



Glauconite limestone, B 2. 12 



Glauconite sandstone, B 5. 11 



Itferbeds, C3 15 



Jewe limestone, D 1 15 



Kegel beds, D 2 15 



Kuckers shale, C2 14 



Lyckholm limestone, F 1 . . 16 



Wassalem beds, D 3 15 



Wesenberg limestone, E . . 16 



orosa, Pseudohomera 174 



orosus, Thamniscus 174 



Orthoceras limestone, B 3 13 



Ostracoda, List of : 22 



ottawaense, Hemlphragma 286 



ovalis, Nematopora 155, 156 



ovulum, Monticulipora 346 



Pachydictya 137 



bifurcata 143 



cyclostomoides. 141 



elegans 138 



flabellum 140 



robusta 138 



Paleogeographic map, Generalized 43 



panderi, Hemiphragma 286 



panderi, Orbipora 280 



Pelecypoda, List of 21 



Pcnniretepora - - - - 159 



peimula, Pteropora 347 



perelegans, Graptodictya 121, 122 



Peronopora 177 



pertenuis, Rhopalonaria 61 



Petalotrypa 178, 265 



compressa 266 



folium 266 



Petigopora 178 



petropolitana, Dianulites 232 



Diplotrypa 232, 313 



pelropolitana {Diplotrypa) Monticulipora 313 



Monticulipora 232, 313 



Page. 



petropolitanus, Chxtetes 232, 313 



petropolitanus, Dianulites 313 



petropolitanus, Favosites 232, 313 



petropolitanus, var. hexaporites, Dianulites 232 



Phaenopora 118 



Phaenopora cf. ensiformis 118 



Phaenopora explanata 118 



Phyllodietya 135 



flabellaris 135 



frondosa 135 



varia .• 136 



Phylloporina 169 



Phylloporina and Fucoid beds, Bryozoa of. . . 30 



PTiylloporina reticulata 170 



Phylloporiaidse ." 168 



piriformis, Callopora 343 



Chsetetes 343 



piriformis, Dianulites 343 



Platteville limestone in Minnesota, Bryozoa 



of. 28 



plumula, Glaueonome 160 



polymorpha, Calamopora 342 



Polyporafurcata 171 



ponderosa, Anolotichia 91 



Nicholsonella 224 



praemmtia, Dekayella 205 



nsevigera, Dekayella 207 



simplex, Dekayella 207 



prsenuntium, Coscinium 146 



Prasopora 177 



primseva, Fistulipora 109 



primigenia, Trematopora 268 



priscum, Heteronema 10,67 



proava, Graptodictya 123 



proavium, Coscinium 123 



proavus, Coscinium 123 



Oorgonia 123 



Protoerisina 71 



exigua 72,73 



ulrichi 73 



proutana, Stomatopora 61 



Pseudohomera 172 



bifida 173 



orosa 174 



Pteropoda, List of 21 



Pteropora 347 



exllis 347 



permula 347 



Ptilodictya 113 



expansa 114 



flabellata 114 



flexuosa 127 



gladiola 114 



Ptilodictya lanceoJatn 114 



Ptilodictya subrecta 116 



Ptilodictyonidfe 113 



Ptilopora disticha 347 



Ptychonema 309 



Publications, List of 48 



pulchellum, Arthroclema 150 



punctata, Archeopora 105, 341 



Callopora 246 



Favositella 105 



pustulifera, Trematopora 306 



pygmeeum, Hemiphragma 289 



quadrata, Nematopora 15S 



