LI.ST OF ILLUSTRATIONS 



PAGE 



607. Chiton, development . ■ • '^0 



60S. Triti .n nodiferus, shell . '^22 



(509. Triton nodiferus, shell, median section . 723 



610. ,, ,, operculum ... • '24 



611. ,, ,, lateral view of body . 724 



612. ,, „ diagram of introvert . 725 



613. ^^ ,, dissection from dorsal side . 727 



614. ,, ,, buccal mass . . . /28 



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, &c. . . 736 



620. Solarium perspectivuiii . . . 737 



621. Terebra oculata . 738 



622. Cypriea moneta . 739 



623. Doris tuberculata 739 



624. Carinaria mediterranua . . 739 

 62.5. Limax . . .739 



626. Sigaretus hevigatus . . 740 



627. Aplysia . . . . 740 



628. Shell-bearing Pteropuda . . 741 



629. Atlanta peronii .... 741 



630. Pterotrachea scutata . . 742 



631. Helix nenioralis . 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. ,, ,, ,, Limna3us . 746 

 6.38. Eyes of Gastropoda . 747 



639. Osphradium of Murex 747 



640. R-^productive organs of Helix . . . 748 



641. Hermaphrodite gland of Gastropoda 749 



642. Forms of egg-cases in Gastropoda . . . . . . 749 



643. Segmentation and formation of germinal layers in Gastropoda 761 



644. Early development of Patella . 752 



645. Troehophore of Patella . , . 753 



646. Later trochophore of Patella . . 754 



647. Yeliger of Vermetus . . 755- 



648. Diagram illustrating the relationships of the Gastropoda 756 



649. Dentalium, section of shell . . ... . 756 



650. ,, anatomy , . . . 757 



651. ,, larvfe . 757- 



652. Rhodope . . . 768 



653. Sepia cultrata . . 760 

 f)54. Sepia, cultrata, shell , . . 762- 

 655. ,, f^chromatophore . • . . . , 762 



