Rutoceras, 518 
Ryder, 380, 386 
Scaphites, 564, 614 
larvee formis, 565 
ventricosus, 565 
Scaphopoda, 392 
Schuchert, 350 
Schroder, 433, 442, 446, 
463, 468, 520 
Schroederoceras, 458, 474, 
475, 592, 597, 607 
angulatum, 460, 462 
Bandonis, 469 
Casinense, 473, 597 
Damesi, 469 
Denckelmanni, 469 
Eatoni, 468, 470, 484, 
485, 597 
Eichwaldi, 485 
Odini, 469 
rarospira, 467 
Saemanni, 463, 467 
teres, 467, 470, 471, 
485 
tubulatum, 464 
Sciponoceras, 578 
baculoides, 578 
Sepioidea, 352, 356, 357, 
373) 374; 
Siphuncle, positions of, 430 
Solenoceras, 519 
Solenocheilus, 528, 545 
caledonicus, 536 
Springeri, 545 
Sphyradoceras, 529 
Spirula, 357 
Spyroceras crotalum, 360, 
361, 582 
Stanton, 563,.565, 572,573, 
574, 579, 580, 614 
Statogenesis, 386 
Strombolituites, 509 
Bolli, 510 
Strophiceras, 518 
Surroundings, action of, 
377 
Syncoryne, 398 
646 
Syringoceras, 546 
evolutum, 546 
granulosostriatus, 
546, 602 
linearis, 546, 602 
Systrophoceras, 502 
arietinum, 502 
pingue, 502 
rapax, 502 
Table, descriptive terms, 
428 
Ontogeny, 391, 397 
Phylogeny, 397 
Tachygenesis, 401, 403, 
404, 406, 407, 411, 415, 
418, 616 
Tainoceras, 497 
Tainoceratide, 458, 491 
Tarphyceras, 433, 441, 
442, 456, 592, 594, 
595, 607, 614 
aucoini, 435, 437 
calciferus, 456 
Champlainense, 435, 
436, 438 
convolvens, 441 
extensum, 435, 438 
Farnsworthi, 435, 449 
Mac Donaldi, 435 
prematurum, 432,434, 
435, 437 
Seeleyi, 435 
Tegulum, 392 
Temnocheilus, 408, 494, 
601 
subtuberculatus, 496 
Thoracoceras, canalicula- 
tum, 540, 603 
puzosianum, 540, 603 
Thrincoceras, 544 
Kentuckiense, 544 
Trachyceras munsteri, 
414 
Triboloceratidze, 540 
‘Triplooceras, 519 
inspiratum, 519 
regulum, 519 
Trochoceras, 502 
angulatum, 500 
Davidsoni, 502 
disjunctum, 500 
Gebhardi, 503 
opatum, 500 
placidum, 500 
regulum, 519 
speciosum, 504 
transiens, 492 
turbinatum, 503 
Tropites subullatus, 417 
Trocholites, 434, 436, 458, 
460, 466, 471, 472, 
484, 517, 520, 584 
585, 596, 614 
ammonius, 484, 487 
anguiformis, 490 
arietinum, 502 
Blakei, 490 
Canadense, 486, 527, 
587, 596, 605 
circularis, 484, 489 
contractus, 489 
Damesi, 469, 489 
depressus, 489 
dyeri, 489 
hospes, 488 
incongruus, 488 
internastriata, 484 
macromphalus, 489 
macrostoma, 489 
minusculus, 490 
multicostatus, 502 
orbis, 489 
pingue, 502 
planorbiformis, 490 
rapax, 502 
Remelei, 484, 489 
scoticus, 491 
soraviensis, 489 
Trocholitoceras, 458, 478, 
480, 596 
Eichwaldi, 484 
Walcotti, 476, 480, 
485, 607 
Turrilites, 566 
Boblayei, 567 
Coynarti, 567 
