LIST OF ILLUSTRATIONS 



656. Sepia, cultrata, cranial cartilage . . . . . . . 763 



657. ,, ,, nuchal cartilage 763 



658. ,, ,, mantle-cavity 764 



659. ,, officinalis, jaws 765 



660. ,, section of buccal mass 766 



661. ,, officinalis, enteric canal 766 



662. , , cultrata, dissection of male from posterior aspect . . . 767 



663. ,, ,, lateral dissection of male 768 



664. ,, officinalis, longitudinal section of ink-sac . . 769 



665. ,, cultrata, vascular system 770 



666. ,, ,, cephalic ganglia 770 



667. ,, ,, pedal and pleuro-visceral ganglia .... 770 



668. ,, section of eye 771 



669. ,, cultrata, statolith 772 



670. ,, officinalis, renal organs 773 



671. ,, diagrammatic sagittal section of female . . . 774 



672. ,, male reproductive organs 775 



673. ,, sperms and spermatophore 775 



674. Nautilus pompilius, section of shell .... . 776 



675. ,, ,, female in shell . . . . . . 778 



676. Nautilus macromphalus, entire animal 379 



677. Nautilus pompilius, lobe of foot 780 



678. spadix 781 



679. ,, ,, cephalic cartilage 781 



680. ,, ,, mantle-cavity of male 782 



681. ,, ,, dissection of male from left side . . . 784 



682. ,, ,, arteries 785 



683. ,, renal sacs, ctenidia, &c 786 



684. ,, ,, male reproductive organs 788 



685. ,, female ,, 788 



686. ,, macromphalus, egg 789 



687. Octopus vulgaris 791 



688. Loligo vulgaris 792 



689. Argonauta argo 793 



690. Octopus lentus, male 793 



691. Amphitretus pelagicus 794 



692. Shell of Spirula 794 



693. Spirula peronii 795 



694. Ammonite 795 



695. Shell of Belemnite 796 



696. ,, Argonauta argo 796 



697. Segmentation of Loligo 798 



698. Blastoderm of Sepia 799 



699. ,, ,, sections 799 



700. Development of Loligo 800 



701. 801 



702. .... 801 



703. . . 802 



704. Diagram to illustrate the relationships of the Cephalopoda . , 804 

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