CONTENTS. XI 



CHAPTEE XVI. 



Ctenophora General Characters Anatomy of Pleurobrachia Divi- 

 sions of Ctenophora PAGE 110-114 



CHAPTEE XVII. 



Distribution of Actinozoa in Space Coral Eeefs, their Structure, and 

 Mode of Origin Distribution of Actinozoa in Time Tabular View 

 of the Divisions of the Zoantharia Sclerodermata and Eugosa . 115-120 



CHAPTEE XVIII. 



Annuloida General Characters of the Annuloida General Characters 

 of the Echinodermata Development of the Echinodermata Divi- 

 sions of Echinodermata . . . 121-123 



CHAPTEE XIX. 



Echinoidea General Characters Anatomy of Echinus Divisions of 

 Echinoidea 124-128 



CHAPTEE XX. 



Asteroidea and Ophiuroidea General Characters of the Asteroidea 

 Divisions of the Asteroidea General Characters of the Ophiuroidea 

 Families of the Ophiuroidea 129-132 



CHAPTEE XXI. 



Crinoidea, Cystoidea, and Blastoidea General Characters of Crinoidea 

 Of Cystoidea Of Blastoidea 133-136 



CHAPTEE XXII. 



Holothuroidea General Characters Families of Holothuroidea . 136-138 



CHAPTEE XXIII. 



Distribution of Echinodermata in Space Distribution of Echinoder- 

 mata in Time Crinoidea Blastoidea Cystoidea Asteroidea 

 Ophiuroidea Echinoidea Holothuroidea .... 138-141 



CHAPTEE XXIV. 



Scolecida General Characters of the Class Scolecida Entozoa 

 Platyelmia Tseniada Structure and Development of the Tape- 

 worm Hydatids 141-146 



