xxx LIST OF ILLUSTRATIONS 



Fir,. PAUF; 



617. Sepia, cultrata, shell 711 



618. ,, chromatophore 711 



619. ,, cultrata, cranial cartilage 712 



620. ., ,, nuchal cartilage 712 



621. ,, ,, mantle-cavity . 713 



622. ,, officinalis, jaws 714 



623. ,, section of buccal mass 715 



624. ,, officinalis, enteric canal 715 



625. ,, cultrata, dissection of male from posterior aspect . . . 716 



626. ,, ,, lateral dissection of male 717 



627. ,, officinalis, longitudinal section of ink-sac .... 718- 



628. ,, cultrata, vascular system 719 



629. ,, ,, cephalic ganglia 719 



630. ,, ,, pedal and pleuro-visceral ganglia .... 719 



631. , , section of eye 720 



632. ,, cultrata, otolith 721 



633. ,, officinalis, renal organs 722 



634. ,, ,, diagrammatic sagittal section of female . . . 723 



635. , , male reproductive organs 724 



636. ,, sperms and spermatophore . . . . . . . 725 



637. Nautilus pompilius, section of shell 726 



638. ,, female, in shell 727 



639. ,, ,, spadix 728 



640. ,, ,, cephalic cartilage 729 



641. ,, ,, mantle-cavity of male 730 



642. ,, ,, dissection of male from left side . . . 731 

 (542 /)/.*. ,, ,, arteries 733 



643. ,, ,, renal sacs, ctenidia, &c 733 



644. ,, male reproductive organs 735 



645. ,, ,, female ., ,, 735 



646. Octopus vulgaris . . . 737 



647. Loligo vulgaris 73$ 



648. Argonauta argo .... 739, 



649. Octopus lentus, male 739 



650. Amphitretus pelagicus .... 740 



651. Shell of Spirula ....... . . . '. 740 



652. Spirula peronii . . 74^ 



653. Ammonite 741 



654. Shell of Belenmite .... 74i> 



655. ,, Argonauta argo 742 



656. Segmentation of Loligo . 745 



657. Blastoderm of Sepia .... 745 



658. ,, ,, sections .... 746 



659. Development of Loligo . . 747 



660. ' 748 , 



<'><'>1. .* . 748 



<''< it . 749 



(',);:;. Diagram to illustrate the relationships of the Cephalopoda . 750 



