r90 



NKW YOKK STATE MUSKUM 



Dictyonenia flabelliforme, explanation 

 of plate, 748-49. 



figures, 601, 602. 



var. confertum, 605. 

 explanation of plate, 749. 



mut. norvegicum, 605. 



zone, 491, 492-93, 501-2, 508. 

 furciferum sp. nov., 504-5, 573, 606-7. 



explanation of plate, 752. 



figure, 607. 

 graptollthinum, 600. 

 hisingeri, 599. 

 irregularis, 496. 

 murrayi, 496, 504-5, 573, 606, 656. 



explanation of plate, 753. 

 norvegicum, 600, 605. 



var. acadicum, 605. 

 peltatum, 549, 607. 

 perexile, 608. 

 rarum, figures, 593, 594. 

 rectilineatum sp. nov., 504-5, 573, 607-9, 

 612. 



explanation of plate, 752. 



figure, 608. 

 robusta, 496. 

 sadewitzense, 600. 

 sociale, 600. 

 tuberosum, 599. 

 Dietyonema zone, 490. 

 Didymograpsus bryonoides, see Grapto- 



lites (Didymograpsus) bryonoides. 

 caduceus, 655, 658, 693. 

 extensus, see Graptolites (Didymograp- 

 sus) extensus. 

 fruticosus, see Graptolites (Didymo- 

 grapsus) fruticosus. 

 geminus, 692. 



Didymograpsus logani, sec Graptolites 

 (Didymograpsus) logani. 

 nitidus, 671. 



octobrachiatus, see Graptolites (Didy- 

 mograpsus) octobracliiatus. 

 quadribrachiatus, see Graptolites (Didy- 

 mograpsus) quadribrachiatus. 

 Didymograptidae, 530, 546, 550, 718-29. 

 Didymograptini, 546. 

 Didymograptus, 474, 476, 478, 494, 495, 

 497, 508, 509, 516, 531, 535, 537, 544, 

 549, 552, 554, 555, 560, 562, 563, 566, 

 567, 568, 571, 573, 610, 660, 666-68, 

 695, 743, 744. 

 figure, 485. 

 (Leptograptus) sp., 680. 

 sp. nov., 679, 682, 700. 

 acutidens, 506-7, 560, 573, 667, 683-84, 

 685. 

 explanation of plate, 773. 

 figures, 683, 684. 

 afflnis, 555, 562, 667, 682, 683, 688. 

 areuatus, 556. 

 balticus, 679. 



bifidus, 497, 498, 499, 506-7, 536, 555, 

 557, 559, 573, 579, 586, 590, 591, 608, 

 609, 621, 623, 626, 627, 629, 636, 651, 

 652, 654, 657, 659, 660, 665, 666, 667, 

 670, 675, 678, 680, ?683, 688, 689-92, 

 693, 694, 703, 707, 710, 713, 715, 744, 

 745, 746, foUomng p.503. 

 explanation of plate, 776. 

 figure, 691. 



zone, 496-98, 504, 506, 508, 653, 656, 

 746. 

 (Isograptus) caduceus, 506-7, 550, 573, 

 658, 660, 662, 668, 693-98, 699, 700, 

 744. 

 explanation of plate, 776. 



