300 GENERAL ZOOLOGY 



ITT. C<ELENTERA 



Class 1. Hydrozoa ; example, Hydra viridis. 

 Class 2. Scyphozoa ; example, Aurelia flavidula. 

 Class 3. Actinozoa ; example, Metridium raarginatum. 

 Class 4. Ctenophora ; example, Pleurobrachia rhododactyla. 



IV. PLATYHELMINTHES 



Class 1. Turbellaria ; example, Dendrocoelum lacteum. 

 Class 2. Trematoda; example, Distomum somaterise. 

 Class 3. Cestoda ; example, Taenia saginata. 



V. NEMATHELMINTHES 

 Class 1. Nematoda; example, Trichina spiralis. 



YT. TROCIIELMINTHES 



Class 1. Rotifera ; example, Brachionus urceolaris. 



YTT. MOLLUSCOIDA 



Class 1. Polyzoa ; example, Plumatella repens. 

 Class 2. Brachiopoda ; example, Lingula lepidula. 



YTIT. ECHINODERMA 



Class 1. Asteroidea ; example, Asterias vulgaris. 



Class 2. Ophiuroidea ; example, Astrophyton agassizii. 



Class 3. Echinoidea : example, Strongylocentrotus drobachiensis. 



Class 4. Holothuroidea ; example, Cucumaria chronhjelmi. 



Class 5. Crinoidea; example, Pentacrinus blakei. 



IX. ANNULATA 



Class 1. Chsetopoda; example, Lumbricus terrestris. 

 Class 2. Hirudinea ; example, Placobdella rugosa. 



X. ARTHROPODA 



Class 1. Crustacea; example, Cambarus affinis. 

 Class 2. Xiphosura; example, Limulus polyphemus. 

 Class 3. Arachnida ; example, Argiope riparia. 

 Class 4. Myriapoda; example, Lithe-bins americanus. 

 Class 5. Hexapoda ; example, Melanoplus femur-rubrum. 



