INDEX 



DO9 



laqueatum, 439. 



lentum sp. nov., 433-34, 509, 512. 



explanation of plate, 556. 



figure, 433. 

 marcoui, 426. 

 maro, 448. 



missisquoi, 508, 511, 513. 

 modestum sp. nov., 436-37, 509, 512. 



explanation of plate, 552. 



figure, 436. 

 moniliforme, 487. 

 montrealense, 425. 

 montrealensis, 424. 

 multicameratum, 518, 519. 

 ordinatum, 419. 

 perannulatum, 448. 

 perseus, 508, 511, 512. 

 primigenia, 504. 



primigenium, 399, 408, 418, 504-5. 

 progressum sp. nov., 433, 434, 509, 

 512. 



explanation of plate, 552. 



figure, 434. 

 rectiannulatum, 506, 511, 512. 

 recticameratum, 437. 

 repens, 508, 511, 512. 

 richteri, 486. 

 sayi, 419, 508, 511, 513- 

 shumardi, 436, 437. 

 sordidum, 424. 

 subarcuatum, 445, 448, 487, 488, 



518-19. 

 tenuiseptum, 408. 

 tityrus, 508, 511, 513. 

 vaguni sp. nov., 433, 434, 435-35, 

 509, 512. 



explanation of plates, 546. 554. 

 velox, 410, 412. 

 xerxes, 508, 511, 513. 

 Orthoceratida, 431-54, 509-10. 

 Orthoceratites, 493. 

 Orthochoanites, 431-86, 507, 509-10. 

 Or3^goceras gen. nov., 449-50, 510. 

 cornu-oryx, 449, 450-51, 510, 512. 



explanation of plate, 556. 

 » figure. 451. 



Paleogeographic distribution 



cephalopods, 514. 

 Paleoteuthis dunensis, 493. 



of 



Paractinoceras, 489. 



canadense, 491. 

 Perkins, G. H., acknowledgments 

 to, 394, 424; collections by, 396, 

 473, 479, 490, 499, 5oi. 

 Philipsburg, Beekmantown formation, 



395 ; fauna, 474, 475, 508, 521, 525. 

 Phragmoceratidae, 501. 

 Piloceras, 429-30, 509, 513- 5i6, 517, 

 523, 524, 527. 

 canadense, 519. 

 explanator, 429-30, 509, 512. 



explanation of plates, 548, 550. 

 triton, 429. 

 Piloceratidae, 429-30, 509. 

 Plates, explanation of, 529-604. 

 Plattsburg. fauna, 503. 

 Plectoceras, 470, 482-83, 510, 513, 522, 

 523, 524, 526. 

 halli, 483, 520. 



(Nautilus) jason, 454, 455, 483, 

 484-86, 510, 512, 518, 520. 

 explanation of plates, 576, 586, 



588, 590. 

 fi.gares, 484, 4S5 

 Plectoceiotida, 454-86, 510. 

 Plectoceratidae, 450, 470, 482-86, 510. 

 Point Levi^, fauna, s^^- 

 Poughkeepsie, fauna, 518. 

 Previous investigations, statement of, 



395-96. 

 Primitia seelyi, 399. 

 Proterocameroceras brainerdi, see 

 Cameroceras (Proterocamero- 

 ceras) brainerdi. 

 Protobactrites, 432, 433. 

 Protocycloceras, 438-41, 440. 441, 510. 

 cf. furtivum, 445, 510, 512. 



explanation of plate, 560. 

 lamarcki, 440, 441^43, 5 10, 512, 518, 

 519,525. 

 explanation of plates, 558, 560. 

 figures, 442, 443. 

 wbitfieldi sp. nov., 441, 443^45, 449, 

 510, 512. 

 explanation of plate, 558. 

 figure, 444. 



Quebec, Beekmantown formation, 

 395 ; fauna, 520. 



