1 8 INTRODUCTION 



PHYLUM PORIFERA. 



PHYLUM COELENTERATA. 

 Class L Hydrozoa. 

 Class n. Scyphozoa. 

 Class IIL Actinozoa or Anthozoa. 



PHYLUM OR CLASS CTENOPHORA. 



PHYLUM PLATYHELMINTHES. 

 Class L Turbellaria. 

 Class IL Trematoda. 

 Class IIL Cestoda. 

 Uncertain Class, Nemertinea. 



PHYLUM NEMATHELMINTHES. 

 Class I. Nematoda. 

 Uncertain Classes. 

 Acanthocephala. 

 Gordiaceae. 



PHYLUM ANNULATA, OR ANNELIDA. 

 Class I. Archi-Annelida. 

 Class II. Chaetopoda. 

 Class III. Hirudinea. 



PHYLUM TROCHELMINTHES. 



PHYLUM MOLLUSCOIDEA. 

 Class I. Brachiopoda. 

 Class IL Bryozoa. 

 Class IIL Phoronidea. 



PHYLUM ECHINODERMATA. 

 Class I. Asteroidea. 

 Class II. Ophiuroidea. 

 ^^}\ Class III. Echiftoidea. 



Class IV. Holothuroldea. 



PHYLUM MOLLUSCA. 

 Class I. Pelecypoda. 

 Class IL Amphineura. 

 Class III. Gastropoda. 

 Class IV. Scaphopoda. 

 Class V. Cephalopoda. 



PHYLUM ARTHROPODA. 

 Class I. Crustacea. 

 Class II. Onychophora. 

 Class III. Myriapoda. 

 Class IV. Insecta (Hexapoda). 



Order i. Thysanura (Aptera). 



Order 2. Ephemerida. 



Order 3. Odonata. 



Order 4. Plecoptera. 



Order 5. Isoptera. 



Order 6. Corrodentia. 



