792 



NEW YOKK STATE MUSEUM 



Didymograptus su€cicus, 678, 679. 

 (Goniograptus) thur-eaui, 621. 

 tornquisti sp. nov., 506, 580, 573, 667, 

 688. 

 explanation of plate, 772. 

 Dimorphograptus, 475, 478, 526, 547. 

 Uiplograpsus, 470. 

 antennarius, 731. 

 foliam. 710. 

 Diplograptidae, 489, 499, 514, 517, 518, 

 538, 539, 544, 545, 547, 550, 551, 570, 571, 

 572, 574, 718-29. 

 Diplograptidi, 546. 



Diplograptus, 468, 474, 476, 478, 479, 483, 

 486, 488, 499, 508, 510, 511, 513, 518, 

 519, 521, 522, 525, 529, 538, 539, 540, 

 542, 545, 547, 550, 551, 552, 570, 572, 

 574, 577, 579, 718-19, 731. 

 sp., 744. 



figures, 520, 529. 

 sp. nov., 722, following p. 503. 

 amplexicanlis, 491, following p.503. 

 angustifolius, folloioing p.503. 

 appendiculatns, 535, 723. 

 cancellatus, 612. 



dentatus, 499, 500, 503, 506-7, 539, 550, 

 552, 557, 574, 580, 581, 586, 587, 589, 

 608, 609, 610, 611, 612, 626, 632, 636, 

 637, 646, 664, 665, 672, 678, 680, 685, 

 687, 689, 690, 693. 695, 698, 699, 700, 

 712, 713, 715, 716, 718, 719-21, 723, 

 725, 726, 728-29, 730, 731, 732, 734, 

 745, 746, 778, folloioing p.503. 

 explanation of plate, 782. 

 figure, 720. 



zone, 498-500", 504, 506, 508, 722. 

 foliaceus, 478, 479, 525, 526, 528, 542, 

 following p.503. 

 figures, 528. 



Diplograptus iniitilis, 506-7, 574, 718, 

 721. 

 explanation of plate, 779. 

 laxus sp. nov., 499, 500, 506-7, 519, 574, 

 718, 722-23. 

 explanation of plate, 779. 

 longicaudatus sp. nov., 506-7, 574, 718, 

 723. 

 explanation of plate, 779. 

 physophora, 514, 519. 

 pristiniformis, 719. 

 (dentatus), 637. 

 pristis, 542, following p.503. 

 pusillus, following p.503. 

 putillus, 722. 



quadrimucronatus, following p.503. 

 sertularioideus, 723. 

 teretiusculus, 723. 

 vesiculosus, 519, 723. 

 whitfleldi, 477, 520. 

 Diprion, 718. 



Diprionidae, 475, 544, 545. 

 Diprionidian, 484. 

 Discograptus schmidti, 596. 

 Disk, central, 487. 

 Dorsal edge of canal, 486. 

 Dorsal wall, 486. 



Dumfriesshire, black shales of, 470. 

 Dun, W. S., cited, 743. 



Ellergill beds, 633, 720, 725, 726, 729, 730, 

 734, following p.503. See also Skiddaw 

 slates. 



Elles, G. L., cited, 459, 465, 471, 478, 484, 

 485, 495, 502, 525, 535, 536, 549, 550, 554, 

 555, 556, 558, 563, 616, 617, 618, 631, 633, 

 634, 637, 638, 639, 640, 641, 643, 644, 648, 

 653, 661, 667, 673, 675, 676, 687, 690, 695, 

 696, 699, 706. 708, 709, 711, 713, 715, 717, 



