549, 550. _Williamsonia gigas_. [Cambridge Phil. Soc.] 435, 436 551. _Williamsonia spectabilis_. A. G. Nathorst. 437 552. _Williamsonia spectabilis_. [Geological Soc.] 438 553, 554. _Williamsonia Leckenbyi_. A. G. Nathorst. 439, 440 555, 556. _Williamsonia whitbiensis_. A. G. Nathorst. 441 557. _Williamsonia_ sp. [Indian Geol. Survey.] 444 558. _Williamsonia Blandfordi_. [Indian Geol. Survey.] 446 559. _Williamsonia Carruthersi_ 447 560. _Williamsonia Bucklandi_ 449 561. _Williamsonia scotica_ 450 562–564. _Williamsonia scotica_. [Royal Society.] 451–453 565. _Williamsonia spectabilis_; _W. whitbiensis_; _W. mexicana_ 459 566, 567. _Wielandiella angustifolia_ 463, 464 568. _Wielandiella angustifolia_. A. G. Nathorst. 466 569–573. _Williamsoniella coronata_. [Royal Society.] 468–471 574. _Cycadocephalus Sewardi_. A. G. Nathorst. 474 575. _Bucklandia anomala_ 482 576. _Bucklandia Milleriana_ 484 577. _Bucklandia Yatesii_ 485 578. _Bucklandia buzzardensis_. [Trustees of the British Museum.] 486 579. _Bucklandia indica_. [Trustees of the British Museum.] 488 580, 581. _Colymbetes Edwardsi_ 492, 493 [Trustees of the British Museum.] 582, 583. _Cycadolepis_ sp. 495 584, 585. _Carpolithus conicus_ 498 [Trustees of the British Museum.] 586. _Beania gracilis_. [W. G. Carruthers.] 502 587. _Ptilophyllum pecten_. [Trustees of the British Museum.] 513 588, 589. _Ptilophyllum pecten_ 514, 516 [Geological Surv. India.] 590. _Ptilophyllum pecten_ and _Williamsonia Blandfordi_ 517 [Geological Surv. India.] 591. _Ptilophyllum cutchense_. [Geological Society.] 518 592. _Ptilophyllum pecten_ 519 593. _Ptilophyllum pecten_. [Geological Society.] 519 594. _Ptilophyllum pecten_ 520 595. _Ptilophyllum pecten_ 523 596. _Ptilophyllum pecten_. [Trustees of the British Museum.] 523 597. _Ptilophyllum boreale_. A. G. Nathorst. 526 598. _Ptilophyllum antarcticum_; _P. Anderssoni_ 527 599. _Zamites gigas_. [Encyclopaedia Britannica.] 533