peocess-blocks and othee illusteative figuees. xvu 



Fig. Page 

 10. Petalocrinus inferior, restored tracing of an arm-fan 427 



, , 1 9 / longus, outline and branching of arm-fan, and hypo- 



' '1 thetical diagram of the same 432 



■in -lA / exjpansus, tracing of arm -fan, and hypothetical diagram 



1^,1*. I of the same 435 



15. Diagrams of Arachnocrinus bulbosus 437 



1. Bryograptus Kjerulfi 470 



2. Callavei 470 



3,4. ramosus, rar. ctimbrensis noY 471 



5. , stages in the development of 472 



6. Temnograptus multiplex 479 



7. Schizograptus tardifurcatus, sp. nov 481 



8. Fleurograptus vagans 481 



9. Pterograptus (1) 482 



10. Dichograptus separatus, sp. nov 485 



11. Tetragraptus Headi 487 



12. crucifer 488 



13. pendens 491 



14. Postlethwaitii, sp. noY 492 



1 5. Phyllograptus ilicifolius, var . grandis nov 493 



16. Anna 494 



17. Bidymograptus gihherulus, variation in forms of 498 



18. , reverse aspect 499 



19. nitidus 500 



20. , diagram illustrating variations in form 501 



21. Nicholsoni 502 



22,23. patulus 506 



24. fasciculattis 507 



25. V-fractus 508 



26-28. , enlargements of various portions 509 



29. Azygograptus suecicus 515 



30. Biplograptus appendiculatus 518 



31. Cryptograptus antennarius 520 



32. Glossograptus fimhriattis 521 



33. armatus 523 



VOL. LIV. b 



