INDEX 



151 



R 



Resserella emacerata 50 



Resserella meeki *50 



Resserella multisecta 50 



Reticularia fimbriata 82 



Retinella *133 



Rhipidoraella *100 



Rhipidomella hybrida *66 



Rhipidomella pecosi *111 



Rhipidomella vanuxemi 82 



Rhombopora lepidodendroides *108 



Rhombotrypa quadrata 47 



Rhynchotrema capax *49 



Rhynchotreta 81 



Rhynchotreta americana 64, *65 



Romingeria 76 



Ryticeras cyclops *91 



S 



Salt, in Ohio 18 



Sanguinolites sanduskiensis *85 



Sanguinolites websterensis *102 



Schellwienella 101 



Schizodus *1 15 



Schizodus appressus *85 



Schizophoria propinqua *82 



Schizophyta 29 



Schizostoma catilloides *117 



Schuchertella 82, *101 



Scyphozoa 35 



Sea urchins 40 



Semicoscinium 79 



Semicoscinium tenuiceps 61, *62 



Septa, of cephalopods 38 



Septopora biserialis *109 



Sigillaria *107, 120 



Sigillariostrobus 107 



Silurian fossils 56 



Silurian history 17 



Silurian rocks of Ohio 17 



Sinuites cancellatus *52 



Sinus, of brachiopods 36 



Siphonophrentis gigantea 76, *78 



Siphuncle, of cephalopods 38 



Slugs 134 



Soleniscus *1 1 8 



Soleniscus hebe *87 



Solenomorpha lamborni *115 



Sowerbyella rugosa *49 



Sphaerexochus romingeri *71 



Sphaeriidae 126 



Sphaerium *126 



Sphaerocfoma *118 



Sphenophyllum *106, 120 



Sphenopteris *106 



Sphenotus aeolus *102 



Spire, of gastropods 37 



"Spirifer," Devonian 82, *83 



Spirifer cameratus *111 



Spirifer centronatus *100 



Spirifer fimbriata 82 



Spirifer striatiformis *100 



Spiriferina kentuckyensis *11 1 



Spirorbis *38 



Devonian 91 



Spirorbis cincinnatiensis 53 



Sponges 34 



Sporangites 75 



Spyroceras *90 



Squamularia perplexa *110 



Squids 38 



Stagnicola *130 



Starfish 40 



Stegerhynchus 64, *65 



Stegocephalian *24 



Stelleroidea 40 



Ordovician 54 



Stephanocrinus elongatus *72 



Stigmaria *107 



Stomatopora arachnoidea 48 



Straparolus paveyi *68 



Streblotrypa anomala 79 



Streptelasma radicans *60 



Streptelasma rusticum *45 



Striatura *133 



Stribalocystites gorbyi *72 



Strobilops labyrinthica *133 



Stromatopora 57, 75 



Stromatoporoidea 35 



Devonian 75 



Silurian 57 



Strombodes 59 



Strophalosia beecheri *99 



Stropheodonta 82, *83 



Strophitus *124 



Strophomena *SQ 



Strophonella 65 



Strophostylus cancellatus *68 



Strophostylus varians 87 



Stylastraea 77 



Styliolina fissurella *89 



Stylodictyon 75 



Stylodictyon columnare *75 



Succinea *131 



Sulcoretepora *79 



Superposition, Law of 9 



Suture, of cephalopods 38 



Symmetry 



brachiopods 36 



pelecypods 37 



Synaptophyllum simcoense *77 



Syringopora *59, *77 



Syringostroma 75 



Syringostroma densa 75 



Syringothyris typus *100 



Systems exposed, by counties 12 



T 



Tabulipora ohioensis 108 



