xxxii LIST OF ILLUSTRATIONS 



FIG. HAOK 



607. Chiton, development ... 720 



608. Triton nodiferus, shell 722 



609. Triton ,, shell, median section 723 



610. ,, ,, operculum 724 



611. ,, ,, lateral view of body 724 



612. ,, ,, diagram of introvert 725 



613. ,, ,, dissection from dorsal side 727 



614. ,, ,, buccal mass 728 



615. ,, ,, vertical section of buccal cavity .... 728 



616. ,, ,, nervous system from dorsal side .... 730 



617. ,, ,, ,, ,, and related parts, lateral view . 731 



618. ,, ,, section of eye 732 



619. Diagrams of displacement of mantle-cavity, fcc 736 



620. Solarium perspectivum 737 



621. Terebra oculata 738 



622. Cyprcea moneta 739 



623. Doris tuberculata . 739 



624. Carinaria mediterranea . . . - 739 



625. Limax 739 



626. Sigaretus laevigatus 740 



627. Aplysia 740 



628. Shell-bearing Pteropoda 741 



629. Atlanta peronii 741 



630. Pterotrachea scutata 742 



631. Helix nemoralis 742 



632. Pleurophyllidia lineata 743 



633. Patella vulgata .... 743 



634. Pulmonary cavity and related parts in Limax 743 



635. Nervous system of Patella 745 



636. Nervous system of Aplysia 746 



637. ,, ,, ,, Limmeus .746 



638. Eyes of Gastropoda 747 



639. Osphradium of Murex 747 



640. Reproductive organs of Helix 748 



641. Ovotestis of Gastropoda 749 



642. Forms of egg-cases in Gastropoda 749 



643. Segmentation and formation of germinal layers in Gastropoda . 751 



644. Early development of Patella 752 



645. Trochophore of Patella ... 753 



646. Later trochophore of Patella 754 



647. Veliger of Vermetus 755 



648. Diagram illustrating the relationships of the Gastropoda . . 756 



649. Dentalium, section of shell . ' 756 



650. ,, anatomy 757 



651. ,, larvae 757 



652. Rhodope 758 



653. Sepia, cultrata 760 



654. Sepia ,, shell . 762 



655. ,, chromatophore 762 



