Barrandeoceras Stern- 
bergi, 408, 450, 
592, 600 
tyrannum, 406, 453, 
600 
_Bather, 380, 395, 396, 397 
Bathmology, 380, 390 
Beale, 390 
Beddard, 389 
Beecher, 350, 364, 365, 
392, 396, 397, 613 
Belemnoidea, 352, 356, 
357, 358, 373, 374 
Biogenesis, law of, 390 
Bioplastology, 380, 384, 
39° 
Blake, 396, 402, 403 
Brachiopoda, 350, 392 
Branco, 355, 359, 373 
AIT, 413, 414, 415, 417, 
609, 610 
Brooks, 404, 405, 406, 407 
Buckman, 380, 395, 399, 
397, 417, 419 
Ceecosiphonula, 464 
Ceecum, 404, 41I, 412 
Caeleceras, 412 
Caloceras, 410 
Cataplasis, 394 
Cenoceras, 548, 550, 569, 
604. 
aratum, 551, 604 
clausum, 552, 604 
granulosum, 553 
intermedium, 550, 604 
lineatum, 551, 604 
Cenogenesis, 401 
Centroceras, 497 
tetragonum, 497 
ammonis, 497 
ohioense, 497 
Cephalopoda, 392 
Ceratitinze, 414, 416 
Choristoceras, 417 
Cicatrix, 403, 411 
Clarke, 350, 361, 411 
Cladonema, 398 
Clymeninz, 371, 563 
642 
Clymenia 
500, 501 
depressa, 489 
incongrua, 488 
rarospira, 467, 484 
Coelogasteroceras, 498, 
519 
canaliculatum, 498 
Coloceras globatum, 541, 
602, 603 
Conch, 359, 392 
Contact furrow, 408 
Cope, 350, 358, 380, 381, 
385, 386, 387, 396 
Coroniceras, 398 
trigonatum, 397 
Cosmoceras' bifurcatum, 
566, 596, 600 
Cranoceras, 409, 520, 527, 
545 
depressum, 527, 545 
hospitale, 527 
lineatum, 527 
nigrum, 527 
turnum, 527, 598 
Ctetology, 384, 388, 389, 
399 
Crioceras latum, 565 
studeri, 372 
Cycle, 397, 398 
Cyclolituites, 503, 505 
Americanus, 505 
applanatus, 505 
lynceus, 505 
antiquissima, 
Cymatoceras, 548, 553, 
560 
Deslonchampsianum, 
554 
elegans, 553 
radiatum, 554 
simplex, 554 
Cyrtoceras amplicorne, 
SII 
depressum, 527 
hospitale, 527 
lineatum, 527 
liratum, 531 
Murchisonia, 585 
neutrum, 585 
nigrum, 527 
Cyrtoceras nitidum, 585 
tetragonum, 497 
turnus, 527 
uranum, 529 
Dall, 563 
Darwinian doctrine, 387 
Deltoceras, 433, 449 
planum, 450 
Deroceras planicosta, 415 
Descriptive terms, 422 
Dewitz, 506 
Dibranchiata, 352, 353 
Didymoceras, 568, 573, 
614 
cochleatum, 574 
nebrascense, 574 
tortum, 574 
Digonioceras, 548, 
560, 604. 
excavatum, 548, 604 
rotundum, 549 
Diorugoceras planidor- 
satum, 540, 602 
Diphragmoceras, 363, 368, 
405, 412, 416 
Diptychoceras, 578, 581 
loevis, 581 
Diplogenesis, 385, 616 
Discites ammonis, 497 
Discitoceras discors, 545 
Discoceras, 458, 500 
antiquissimum, 
461, 501 
convolvens, 441 
Denckelmanni, 469 
Eatoni, 470 
Graftonense, 501 
teres, 467 
subcostatum, 457 
Dissoconch, 392 
Domatoceras, 545 
Dorsal furrow, 408 
lobe, 408 
549, 
445, 
Echinodermata, 401 
Ectergogenesis, 390 
Edaphoceras, 429, 535 
hesperis, 536 
niotense, 536 
