LIST OF ILLUSTRATIONS xxxiii 



FIG. PAGE 



657. Veliger of Vermetus . 734 



G58. Diagram illustrating the relationships of the Gastropoda . . 736 



659. Dentaliuni, section of shell . ... 736 



660. anatomy . . 737 



661. larva; . ... 737 



662. Sepia cultrata . . . 739 



663. . shell . . . 740 



664. ,, chromatophore 741 



665. ,, cultrata, cranial cartilage ........ 742 



666. ,, ,, nuchal cartilage ........ 742 



667. ,, ,, mantle-cavity 743 



668. ,, officinalis, jaws 744 



669. section of buccal mass .... .... 744 



670. ,, officinalis, enteric canal ........ 745 



671. ,, cultrata, dissection of male from posterior aspect . . . 746 



672. ,, lateral dissection of male 747 



673. ,, officinalis, longitudinal section of ink-sac . . . . 747 

 ii74. ,, cultrata vascular system ........ 748 



675. ,, ,, cephalic ganglia . . . 748 



676. ,, pedal and pleuro-visceral ganglia . . 748 



677. section of eye ... 749 



678. ,, cultrata, statolith .... . 750 



679. ,, officinalis, renal organs 751 



680. ,, ,, diagrammatic sagittal section of female . . . 752 



681. ,, male reproductive organs ........ 753 



682. ,, sperms and spermatophore ........ 753 



683. Nautilus pompilius, section of shell ....... 754 



684. ,, ,, female in shell . 756 



685. Nautilus macromphalus, entire animal . ...... 757 



686. Nautilus pompilius, lobe of foot . . 758 



687. ,, ,, spadix ... . . . 759 



688. cephalic cartilage .... . 759 



689. ,, ,, mantle-cavity of male 760 



690. ,, ,, dissection of male from left side . . . 762 



691. ,, ,, arteries 763 



692. ,, ,, renal sacs, otenidia, &c. ..... 764 



693. ,, ,, male reproductive organs ..... 765 



694. ,, ,, female ,, 766 



695. ,, macromphalus, egg ... 766 



696. Octopus vulgaris . . 768 



697. Loligo vulgaris ... ........ 769 



698. Argonauta argo 769 



699. Octopus lentus, male 770 



700. Amphitretus pelagicus 770 



701. Shell of Spirula . . . 771 



702. Spirula peronii . . . . . . . . . . . .771 



703. Ammonite ............. 772 



704. Shell of Belemmte 772 



