TABLE OF CONTENTS. 



PAKT III. 



Notice, 381. 



Description of the Species, 383. 



For Systematic Table of Contents see 617. 



For Index see 625. 



Errata, Parts I., II., 629. 



PAKT IV. 



Note, 633. 



Terminology, 635. 



The Test, 637. Growth of New Plates, 641. 



Perischoechinidae, 644. 



Spines, 651. Fascioles, 657. Pedicellaria, 659. Sphaeridia, 671. 



Alimentary Canal, 673. Genital Organs, 680. 



Ocular System, 682. Anal System, 683. A< riNOSTOME, 686. 



Jaws, 688. 



Circulation, 691. Water System, 693. Madreforio Body, 704. 



Nervous System, 705. 



Habits OF ECHINI, 706. 



Embryology, 708. On the Foung Stages oi Echini, 731. 



Geological Succession of the Echini, 748, 



Homologies and Affinities ok the Echini, 755. 



