n 



INDEX. 



PAGE. 



Ctenacanthus gemmatus 429 



1 ' gradocostus 425 



' f Keokuk 427 



' ' pugiunculus 430 



' ' sculptus 421 



" simliis 431 



1 ' speciosus 424 



' ' spectabilis 420 



1 ' varians 422 



Ctenopetalus bellulns 398 



limatulas 399 



' ' medius 400 



' ' occidentalis 401 



11 tIdosus 396 



Ctenoptyckius pertenuis 382 



" Stevensoni... 383 



Cumberland county, geology of 98 



" "' Coal Measures of 98 



" " Economical geology of j*03 



Cyathoxonia distorta. 526 



Cyrtoceras Carrollensis •- 496 



' ' dardanus 1 506 



Dactylodus concavus 390 



' ' excavatus 392 



' ' minimus :i91 



Decatur shaft, section of 193 



Desmiodus 337 



" costelliferus 341 



" flabellum 343 



' ' ligoniformis 342 



tumidus 339 



Dichocrinus ficus 515 



Dorycrinus Eelloggi 513 



Douglas county, geology of 110 



Drepan acanthus reversua 456 



Edwards county, geology of 58 



" ' ' Economical geology of 60 



" " coal in 61 



Effingham county, geology of 175 



" " Geological formations of. ...176 



11 " Coal Measures of. 177 



* ' Economical geology of 182 



Erismacanthus McCoyanus 461 



Eucalyptocrinus magnus 501 



Eupachycrinus Craigii 527 



' ' Bassetti 528 



Fayette county, geology of. 135 



" " soil and agriculture of 145 



" " stratigraphical geology of 137 



" " CoalMeasures of. 139 



Fissodus 413 



' ' bifidus 414 



" tricuspidatus 415 



Franklin county, geology of 122 



" " Coal Measures of 123 



" " Economical geology of. 126 



Gallatin county, geology of 197 



11 " stratigraphical geology of. . . .200 



Gallatin county, Coal Measures of 282 



' ' Quaternary formations of. 213 



11 Economical geology of 213 



" ' ' Saline works of 213 



Gampsacanthus 471 



latus 474 



squamosus 473 



typus 472 



Gas wells 192 



Geisacanthus 449 



' ' bullatus. 441 



stellatus 440 



Glymmatacanthus ■■ 446 



Irishii 447 



Hamilton county, geology of 75 



" ' ' Economical geology of 79 



Coal in 79 



" " Building stone in 79 



Harpacodus 354 



' ' compactus 355 



' ' occidentalis 355 



Heterocrinus crassus 493 



Homocrinus angustatns 492 



Hybocladodus 284 



compressus 28? 



intermedins 287 



uitidus 288 



plicatilis 236 



tenuicostatus 286 



Illtenus Graftonensis 508 



Iron ore 29, 43, 62, 87, 96, 103, 110, 121, 144, 182 



Jasper county, geology of 31 



" " Coal Measures in 31 



11 " Economical geology of 35 



Lambdodus 280 



' ' calceolus 281 



costatus 280 



' ' hamatus 283 



" renexus 284 



' ' robustus 282 



Lawrence county, geology of 37 



11 stratified rocks of 38 



" Economical geology of 42 



" Coalin 42 



Lecracanthus 475 



1 ' unguiculns.. 476 



Leiodus 335 



' ' calcaratus 336 



1 ( grossipunctatus 337 



Lisgodus 363 



* ' cnrtus 364 



' ' serratus 365 



' ' selluliformis 366 



Lituites, Graftonensis 507 



Lichas Boltoni 508 



