CONTENTS 



XII. The Sensoey Organs .... 



A. The Ambulacral Appendages as Sensory Organs 



B. Nerve Endings in the Integument 



C. Auditory Organs, Organs or Orientation 



D. Eyes 



XIII. The Body Musculature 



A. Holothurioidea . 



B. Echinoidea 



C. Asteroidea 



D. Ophiuroidea 



E. Crinoidea . 



XIV. The Alimentary Can.\l 



A. General Revie\v 



B. Holothurioide.\ 



C. Echinoidea 



D. Crinoidea . 



E. Asteroidea 



F. Ophiuroidea 



XV. Respiratory Organs 



A. The (inner) Respiratory 



OF the Holothurioidea 



Trees 



B. Eeview of the RESPiR.vroRY Organs of the Echinodeh 

 mata ....... 



XVI. The Cuvieri.in Org.\ns of the Holothurioidea 



XVII. E.XCRETION' ....... 



XVIII. The Sacculi of the Crinoidea 



XIX. Genital Org.^ns 



A. General Morphology 



B. Holothurioidea . 



C. ASTEROIDE.A. 



U. Ophiuroidea 



1. The Burs^ 



2. The Genital Apparatus 



E. Echinoidea 



F. Crinoidea . 



G. Origin of the Sexual Products 

 H. Hermaphroditism in Echinoderms 



1. Care of the Brood and Sexual Dimorphism 



XX. Capacity for Regeneration and Asexual Reproduction 



XXI. Ontogeny ....... 



A. The Various Larval Forms of the Echinodermata 



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