IV CONTENTS. 



PAGE 



Class II. Anthozoa (Actinozoa), . . . . . .29 



Order 1. Rugosa (Tetracoralla), . . .29 



Order 2. Alcyonaria (Octactinia, Octocoralla), . . .29 



Order 3. Zoantharia (Hexactinia, Hexacoralla), . . .29 



Class III. Ctenophora, ....... 32 



SUBGRADE B. C(ELOMATA (Triploblastica), . . 33 



Phylum I. Vermes, ........ 39 



Class I. Platyhelmia (Platyhelminthes), . . . . .44 



Order 1. Turbellaria, ....... 44 



Order 2. Nemertina (Nemertea), . . . . .46 



Order3. Trematoda, ....... 47 



Order 4. Cestoda, ....... 50 



Order 5. Mesozoa, ....... 53 



Class II. Nemathelmia (Neniathelminthes), . . . .54 



Order 1. Nematoda, . . . . . . .54 



Order 2. Acanthocephala, . . . . . .58 



Order 3. Chaetognatha, ....... 59 



Table of Parasitic Worms, ..... 60, 61 



Class III. Rotatoria (Rotifera), . . . . . .62 



Class IV. Annelida (Annulata), . . . . . .63 



Order 1. Archiannelida, ...... 63 



Order 2. Chaetopoda, ..... .63 



Order 3. Hirudinea (Discophora), . . . . .63 



Class V. Gephyrea, .... .70 



Phylum II. Echinodermata, ....... 73 



Class I. Crinoidea, ........ 74 



Class II. Asteroidea, .... 75 



Order 1. Stellerida, ' [ 75 



Order 2. Ophiurida, .... 75 



Class III. Echinoidea, .... 77 



Order 1. Regularia, .... 

 Order 2. Clypeastroidea, 

 Order 3. Spatangoidea, .... 



