SUBDIVISIONS OF INVERTEBRATA. 363 



CLASS II. SCOLECIDA. 



Division A. Platyelmia. 

 Order i. Taeniada. 



2. Trematoda. 



3. Turbellaria. 

 Sub-order a. Planarida. 



b, Nemertida. 

 Division B. Nematelmia, 

 Order 4. Acanthocephala. 



5. Gordiacea. 



6. Nematoda. 

 Division C. Rotifera. 



Order. Rotifera. 



SUB-KINGDOM IV. ANNULOSA. 



DIVISION A. ANARTHROPODA. 

 CLASS I. GEPHYREA. 

 CLASS II. ANNELIDA. 



Order i. Hirudinea l Abranchiata . 



2. Oligoch3eta j 



3. Tubicola 1 Branchiata 



4. Errantia ) 

 CLASS III. CH^ETOGNATHA. 



DIVISION B. ARTHROPODA or ARTICULATA. 

 CLASS I. CRUSTACEA. 

 Sub-class I. Epizoa. 



Order i. Ichthyophthira. 



2. Rhizocephala. 

 Sub-class II. Cirripedia. 



( Balanidoe. 



Order 3. Thoracica. < Verrucidse. 

 ( Lepadidse. 



4. Abdominalia. 



5. Apoda. 

 Sub-class III. Entomostraca. 



Order 6. Ostracoda ) T T , 



7. Copepoda I Legion Lopbyropoda. 



8. Cladocera \ 



9. Phyllopoda ,- Legion Branchiopoda. 

 10. Trilobita ) 



IT. Merostomata. 

 Sub-order a. Xiphosura. 

 b. Eurypterida. 



