CONTENTS OF PART VI. 



PAGE 



34. Contribution to the Natural History of the Pearly Nautilus. 

 By ARTHUR WILLEY, D.Sc., F.R.S. 



I. Personal Narrative ............ 691 



With eighteen figures. (Figures 1, 3, 4, 5, 6, 7, 8, 9, 15, 16 and 18 are printed 

 separately as 7 pages.) 



Arrival at Ralum, 692 ; Native currency, 693 ; Vulcan Island, 694 ; Dredging in 

 Blanche Bay, 696 ; Commerce and Language, 697 ; Trapping Nautilus, 698 ; Ecto- 

 parasites, 700 ; New Hanover, 701 ; The wearing of the kabil, 702 ; Peripatus, 703 ; 

 The mystery of the pepe, 706 ; Maravot, 708 ; Styeloides eviscerans, 710 ; Rhodosmna 

 huxleyi, 711 ; Spawn of Cephalopoda, 712 ; Malira, 713 ; Native fancies, 714 ; Talili 

 Bay, 715 ; Tubuan and Dukduk, 716 ; Milne Bay and Hygeia Bay, 717 ; Amphisile 

 strigata, 718 ; Native devotion, 719 ; Ctenoplana, 720 ; Deboyne Group, 724 ; Lancelet, 

 725 ; Industries of Tubetube, 726 ; Ptychodera Jtava, 727 ; Prochordata, 728 ; Isle of 

 Pines and Mare, 730 ; Sandal Bay, Lifu, 731 ; Egg-laying of Nautilus, 732 ; Astrosclera, 

 733 ; Second visit to New Britain, 734 ; Appendix, 735. 



II. Special Contribution ........... 736 



With Plates LXXV— LXXXIIL, a map and fifteen text-figures. 



1. Historical Survey 736 



2. External Form and Pigmentation 738 



3. Sexual Dimorphism 740 



4. Species and Range 743 



5. Mantle; Shell; Nuchal Membrane 746 



6. Ventral Pallial Complex 753 



7. Siphuncle and Pallial Vessels 754 



8. Funnel and Capito-pedal Cartilage . 763 



9. Digital and Ophthalmic Tentacles 767 



10. Peristomial Haemocoel ; Systemic Aorta ; Cephalic Arteries 780 



11. Reproductive Organs and Genital Arteries . 784 



12. Mechanism of Respiration ; Branchiae and Osphradia; Renal and Pericardial Follicles 788 



13. Eye; Rhinophore; Otocyst 793 



14. The Molluscan Foot . . 795 



15. Changes of Function, Organs and Topography . . . . . . . . 796 



16. Flexure and Orientation 798 



17. Morphology of the Tentacles of Nautilus 800 



18. Diplomerism of Nautilus 804 



19. Affinities 805 



20. Food ; Migration ; Propagation 808 



21. Variation and Regeneration 810 



Description of Plates 813 



Index 827 



