\m CONTENTS. 



CHAl'TEK V. 



(ieiieial characters of the Ca'leiiterata — Divisions of the Ccclen- 

 tirata — General characters of the Hydrozoa — General ter- 

 minology oi the Hydrozt)a, ..... 50-0/ 



GHArTEll VI. 



Divisions of tlie Hydrozoa — Hydnjida — Hydrida — Anatomy of 

 Hyilra — Goiynida — Heiiroduction in the Corynida and in the 

 Hydroid Ziiophytes generally — Alternation of generations — 

 Sertularida — Campanularida — Medusichc, . . . 58-71 



CHAPTER Vll. 



Siphonojihora ir Oceanic Hydrozoa — Calyc(H)horid;e — Physo- 



plioridic, ...... 72-75 



CH.\PTER VIII, 



Lucernarida — Hidih'n-eycd !Mechis:e — Pevelopnicnt of Lucer- 



narida — Rhizostomidic — '■ 'raptolitidic — Hydrocorallinip, . 76-82 



CHAPTER IX. 



CJeneral cliaracters of the Actinozoa — Ztiantliaria — Anatomy of 

 a Sea-anemone — Zoantharia sclerodermata — Sclerodermic 

 and Sclerohasic CVirals — (_'ora] I'Cefs — Zoantharia sclerobasica 



— Alcyonaria — Gorgonida.- — l^ed Coral — Helioporida? — 

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



CHAPTER X. 



General characters of tlie I'^.cliinodermata — 1 )ivisions of the F.cliiu- 

 odermata — Ecliin<tidea — Anatomy of Ecliinus — Astcroidea — 

 Ophiuroidea — Crinoidea — Cystoidea and Blastoidea — Holo- 

 tlmroidoa, ,.,.,., 97-111 



CHAPTER NI. 



General cliaracters and divisions of llie .\nnulosa — (ieneral char- 

 acters of tlic Scolecida — liivisicHis of tlic Scolecida — Ta^niada 

 — Development of a Tajie- worm — Cystic worms — ^Frematoda 



— Turhellaria — .Vcantliocepliala — ( ioi-diacea — Nematoda — 

 Rotifcra, ....... 112-126 



CHAPTER XI t. 



General characters of tlie An.artliro]ioda — <"ici'liyrea — Annelida — 

 Dl\'i,^ioiis of the Annelida — Hirndinea — Oligocha-ta — Poly- 

 ch;cta, ........ 127-135 



