xxxii LIST OF ILLUSTRATIONS 



FIG. PAGE 



609. Chiton spinosus, dorsal view 696 



610. ventral view .696 



611. valves of shell 696 



612. Chaetoderma nitidulum, longitudinal section 697 



613. Chiton, longitudinal section 697 



614. Nervous system of Amphineura 698 



615. Neomenia carinata, reproductive organs 699 



616. Chiton, nephridial and genital systems 700 



617. Chiton, development 701 



618. Triton rubicundus, shell 703 



619. shell, median section 703 



620. operculum 704 



621. lateral view of body 705 



622. diagram of introvert 705 



623. ,, ,, dissection from dorsal side 707 



624. buccal mass . . 708 



625. ,, ,, vertical section of buccal cavity .... 708 



626. ,, nervous system from dorsal side . . .710 



627. ,, ,, ,, and related parts, lateral view . 711 



628. ,j section of eye 712 



629. Diagrams of displacement of mantle-cavity, &c. . . . .716 



630. Solarium perspectivum 718 



631. Terebra oculata 718 



632. Cyprsea moneta . . . 719. 



633. Doris tuberculata . 719 



634. Carinaria mediterranea . 719 



635. Limax 719 



636. Sigaretus Isevigatus 720 



637. Aplysia 720 



638. Shell -bearing Pteropoda 721 



639. Atlanta peronii 721 



640. Pterotrachea scutata 721 



641. Helix nemoralis 722 



642. Pleurophyllidia lineata 723 



643. Patella vulgata 723 



644. Pulmonary cavity and related parts in Limax 723 



645. Nervous system of Patella 725 



646. Aplysia 726 



647. Limnseus 726 



648. Eyes of Gastropoda 727 



649. Osphradium of Murex 727 



650. Reproductive organs of Helix 728 



651. Ovotestis of Gastropoda 729 



652. Forms of egg-cases in Gastropoda 730 



653. Segmentation and formation of germinal layers in Gastropoda . 731 



654. Early development of Patella 732 



655. Trochophore of Patella 733 



656. Later trochophore of Patella 733 



