C. carinatus, 454. 
Conodonts, 520. 
Copopontipm, 331, 332, 462, 464. 
Coronus, 331, 464. 
©. cornutus, 464, 465, 466, 467, 468, 471, 477. 
C. furcatus, 466, 467. 
C. lunulatus, 464, 465, 477. 
C. minimus, 467, 468. 
C. spatulatus, 467. 
CosMACANTHUS, 355. 
. carbonarius, 356, 357. 
. carinatus, 356, 
. malcolmsoni, 355, 356, 357. 
. Marginalis, 356. 
. priscus, 398. 
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QeQ 
369, 438, 527, 533. 
. brevis, 337. 
. burlingtonensis, 333. 
. crenatus, 340, 345. 
. crenulatus, 345. 
. denticulatus, 338, 339, 340. 
. distans, 347, 349. 
. dubius, 340. 
. gracillimus, 333, 347. 
. gradocostus, 339. 
heterogyrus, 336. 
keokuk, 333, 348. 
levis, 341, 342, 343, 344. 
limaformis, 339. 
major, 334, 335. 
. plicatus, 342, 344. 
. pustulatus, 344. 
. rectus, 345. 
. Salopiensis, 339. 
. spectabilas, 338. 
. Suleatus, 343, 344. 
. tenuistriatus, 335. 
Ctenodus, 411, 412. 
Crenoperauus, 484, 511. 
C. crenatus, 513. 
C. medius, 513. 
C. serratus, 484, 512. 
Otenoptychius, 412, 457, 484, 508, 511, 512, 514. 
C. apicalis, 484, 
C. dentatus, 511, 514. 
CO. macrodus, 514. 
C. serratus, 484, 511, 512. 
Cyclostomata, 328. 
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Dactylodus, 484, 500. 
D. inflexus, 500. 
D. princeps, 484, 503. 
Dettopus, 410, 415, 417, 427, 436, 441. 
D. aliformis, 431. 
D. expansus, 431. 
D. grandis, 438. 
D. subleevis, 414, 428, 431, 432, 437, 438, 448. 
Deutoprycuius, 410, 415, 417, 428, 432. 
D. acutus, 414, 417, 433, 434, 435. 
D. gibberulus, 435. 
Dendrodus, 524. 
Dens tritor rugosus, 459, 460. 
Derbyshire, Mountain Limestone of, 542. 
« 
TENACANTHUS, 331, 332, 347, 348, 349, 350, 359, 
598 
Diciitopus, 389, 409. 
D. scitulus, 410. 
Dictea striata, 492. 
Dimyuevs, 478, 479, 480. 
D. woodii, 478. 
Diodon, 521, 522. 
D. maculatus, 521. 
Diodontopsodus, 519. 
Dipnotr, 328. 
Drertacantuus, 360, 363. 
D. faleatus, 365. 
D. stokesii, 360. 
Drepanacanthus, 370, 371. 
Elasmobranchit, 328, 330. 
Enneodon, 521. 
ERISMACANTHUS, 364. 
E. jonesii, 365. 
Farlow, Limestone at, 541. 
Gampsacanthus, 363. 
G. typus, 363. 
Ganordet, 328, 340. 
Guossopus, 509. 
G. lingua-bovis, 510. 
G. marginatus, 510. 
GiyPHANODUS, 386. 
G. tenuis, 386. 
GNATHACANTHUS, 363. 
G. striatus, 364. 
G. triangularis, 363, 364. 
Gymnodonts, 521. 
Gyracanthus, 533. ° 
Harpacopus, 484, 511, 512, 514. 
H. clavatus, 515. 
H. dentatus, 484, 514, 515. 
Hetopus, 397, 400, 403, 412, 415, 416, 438, 451 
456, 508. 
H. acutus, 455. 
H. clavatus, 455. 
H. crassus, 453. 
H. didymus, 403, 407. 
H. expansus, 457. 
H. gibberulus, 405, 411. 
H. levissimus, 399, 404. 
H. mammillaris, 403, 406. 
HI, nobilis, 452. 
H. planus, 403, 439, 440, 441, 453. 
H. richmondiensis, 456. 
H. rudis, 457. 
H. simplex, 456. 
H. subteres, 399, 400, 411. 
H. tenuis, 354. 
H. triangularis, 456, 457. 
H. turgidus, 403, 453, 499. 
Holocephala, 329. 
Homacantuus, 351, 361. 
H. arcuatus, 362. 
H. microdus, 361, 362. 
H. macrodus, 362. 
Homatopus, 481. 
H. trapeziformis, 482. 
