CONTENTS. 



CHAPTER V. 



General characters of the Ccelenterata — Divisions of the Coslen- 

 terata — General characters of the Hydrozoa — General ter- 

 minology of the Hydrozoa, ..... 50-57 



CHAPTEK TI. 



Divisions of the Hydrozoa — Hydroida — Hydrida — Anatomy of 

 Hydra — Corynida — Reproduction in the Corynida and in the 

 Hydroid Zoophytes generally — Alternation of generations — 

 Sertularida — Campanularida — Medusida), . . . 58-71 



CHAPTER VII. 



Siphonophora or Oceanic Hydrozoa — Calycophoridae — Physo- 



phorida;, . . .... 72-75 



CHAPTER VIII, 



Lucernarida — Hidden-eyed Medusae — Development of Lucer- 



narida — Rhizostomida; — Graptolitidse — Hydrocorallinje, . 76-82 



CHAPTER IX. 



General characters of the Actinozoa — Zoantharia — Anatomy of 

 a Sea-anemone — Zoantharia sclerodermata — Sclerodermic 

 and Sclerobasic Corals — Coral-reefs — Zoantharia sclerobasica_ 

 — Alcyonaria — Gorgonida^ — Red Coral — Helioporidfe — 

 Rugose Corals — Ctenophora — Anatomy of Pleurobrachia, . 83-96 



CHAPTER X. 



General characters of the Eohinodermata — Divisions of the Echin- 

 odermata — Echinoidea — Anatomy of Echinus — Asteroidea — 

 Ophiuroidea — Crinoidea — Cystoidea and Blastoidea — Holo- 

 thuroidea, . . . 97-111 



CHAPTER XI, 



General characters and divisions of the Annulosa — General char- 

 acters of the Scolecida — Divisions of the Scolecida — Tseniada 

 — Development of a Tape-worm— Cystic worms — Trematoda 

 — Turbellaria — Acanthooephala — Gordiacea — Nematoda — 

 Rotifera, . . . .112-126 



CHAPTER XII. 



General characters of the Anarthropoda — Gephyrea — Annelida — 

 Divisions of the Annelida — Hirudinea — Oligoohseta — Poly- 

 chfcta, . ... 127-135 



