xxx LIST OF ILLUSTRATIONS 



FIO. PAOB 



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 

 642 //.-;. ,, ,, arteries . 733 



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



644. ,, ,, male reproductive organs 735 



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



646. Octopus vulgaris . ... 737 



647. Loligo vulgaris . ... 738 



648. Argonauta argo ... . . . . 739 



649. Octopus lentus, male . 73V) 



650. Amphitretus pelagicus . ... 740 



651. Shell of Spirula . 740 



652. Spirula peronii . . 741 



653. Ammonite . . 741 



654. Shell of Belemnite . . 742 



655. ,, Argonauta argo . . 742 



656. Segmentation of Loligo . . 745 



657. Blastoderm of Sepia . . . . 745 



658. ,, ,, sections . . 746 



659. Development of Loligo . . 747 



660. ,, .748 

 61)1. ,, .748 



t;r,_>. ,, ,, ... . 749 



663. Diagram to illustrate the relationships of the Cephalopoda . . 750 



