599 
H. quadratus, 482. O. minor, 525, 526, 528, 529. 
Hook Point, Limestone at, 538. O. pustulosus, 525, 526, 528, 534. 
Hybodonts, 370, 388, 507. Oreton, Limestone at, 541. 
Hypopontips, 331, 332. OroDONTIDA, 331, 386. 
Hybodus, 333, 334, 346, 372. Orodont, 400, 512. 
Oropus, 331, 387, 388, 389, 390, 403, 407, 410, 
Ichthyodorulite, 334, 346, 370. 412, 420. 
. angustus, 394, 395, 
. carinatus, 394. 
. catenatus, 395. 
. cinctus, 391, 392. 
. compressus, 393, 394. 
. elongatus, 393, 394, 395, 399. 
. gibbus, 395, 396. 
mammillaris, 398. 
moniliformis, 397, 398. 
ornatus, 397, 398. 
. porosus, 393. 
. ramosus, 390, 391, 392, 393, 438. 
reedi, 398. 
. sculptus, 392. 
. Subteres, 399, 406. 
. tenuis, 399. 
. timidus, 390. 
I. brevis, 337. 
I. curvicostatus, 525, 526. 
Ireland, Mountain Limestone in South Eastern 
portion, 538. 
Janassa, 331, 486, 488, 489, 490, 491, 492, 511, 
518. 
J. bituminosa, 491. 
Lasopus, 468. 
L.. planus, 470. 
L. prototypus, 468, 470. 
Leptacanthus, 333, 346, 347, 351, 352, 362. 
L. jenkinsont, 346, 347, 351. 
L. gunceus, 346, 350, 351. 
L. occidentalis, 333, 347. 
LL. priscus, 346, 358. 
Leptocardii, 328. 
CO9D9D9DDD DOS 00000590 
Lispacantuus, 359. PaLmicutuytsEs, 328. 
L, gracilis, 359. PETALODONTIDS, 331, 483, 484, 488. 
L. retrogradus, 359, 360. PETALoDUS, 331, 381, 412, 415, 483, 492, 493, 496;, 
Localities, Description of, 535. 498, 499, 507, 508, 512, 516, 518. 
Localities, tabulated list of, 545. P. acuminatus, 483, 494, 497. 
Lopnovus, 387, 389, 397, 403. P. dentatus, 514. 
L. bifurcatus, 408. P. destructor, 496, 
L. didymus, 407. PB. grandis, 496. 
L. gibberulus, 405, 406. P. hastingsia, 483, 484, 493. 
L. leevissimus, 404, P. inequilateralis, 497, 498. 
L. levis, 409. P. levissimus, 483, 493, 494. 
L. mammillaris, 406, 408. - P. linguifer, 497. 
L. reticulatus, 407. - P. marginalis, 483, 494. 
L. sinuosus, 409. P. radicans, 483, 499, 550. 
L. serratus, 408, 409. P. rectus, 483, 494, 498. 
; - P. recurvus, 497. 
Marsipobranchii, 328. P. rhombus, 494. 
Mrsocompuus, 470, 472. P. sagittatus, 483, 516. 
M. lingua, 471. P. serratus, 512. 
Mvytacopts, 480. Preratopopsis, 498. 
M. quadratus, 480, 481. P. tripartitis, 499. 
M. sesamini, 481. PETaLorHyNcuus, 331, 484, 485, 486, 489, 490, 
ee ewe ADL, 199, STL, Bis 
- batolaes, . P. pseudosagitiatus, 518, 519. 
Myliobates, 490, 491, 492. 1D, pallor) 484, 516, 519. 
M. aquila, 488. P. sagittatus, 484, 518, 519. 
P. spatulatus, 518. 
Nemacanthus, 358. Perropus, 387, 389, 400, 438. 
N. priscus, 358. P. patelliformis, 400. 
Northumberland, Limestone of, 543. Pharyngobranchit, 328. 
PHODERACANTHUS, 533. 
Onchus, 342, 344, 346, 370, P. grandis, 534. 
0. hamatus, 370. Piychodus, A18. 
O. plicatus, 342. Puysonemus, 349, 367. 
O. rectus, 345, 346. P. arcuatus, 367, 369, 370 
O. sulcatus, 343. P. attenuatus, 369. 
Oracantuus, 525, 528, 530, 533, P. gigas, 368. 
O. confluens, 525, 526, 528, 529. D, ena, O70 
O. milleri, 525, 526, 528. P. subteres. 368, 369, 370. 
TRANS, ROY, DUB, SOC., N,S,, VOL, Ip 4U 
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