XX 



SCHEME OF THE CLASSIFICATION 



Order 2. ALCYONACEA . 139 



" 3. GORGONACEA . 139 



" 4. PENNATULACEA 140 



Subclass II. Zoantharia . .141 



Order i. EDWARDSIIDEA 141 



PAGE 



Order 2. ACTINIARIA . .141 



" 3. MADREPORARIA 141 



4. ZOANTHIDEA . 142 



" 5. ANTIPATHIDEA . 142 



" 6. CERIANTHIDEA . 142 



PHYLUM IV. CTENOPHORA . . . 

 PHYLUM V. PLATYHELMINTHES . 



Class I. TURBELLARIA. 

 Order i. RHABDOCCELIDA 

 " 2. TRICLADIDA . 



" 3. POLYCLADIDA 



155 Class II. TREMATODA 



156 Order i. MONOGENEA 



156 " 2. DlGENEA . 



157 Class III. CESTODA . 



MS 



. 150 



157 

 . 161 

 . 161 

 . 163 



PHYLUM VI. NEMATHELMINTHES . . . 169 



GROUPS OF INVERTEBRATES OF MORE OR LESS 

 UNCERTAIN SYSTEMATIC POSITION . . . 



Group i. MESOZOA . . . .176 Group 6. ROTIFERA . . . 

 " 2. NEMERTINEA . . 177 " 7. BRYOZOA . . . . 

 " 3. NEMATOMORPHA .179 u 8. PHORONIDEA . . 



" 4. ACANTHOCEPHALA . l8o 9. BRACHIOPODA . . 



5. CH^ETOGNATHA . 



1 80 



10. GEPHYREA 



PHYLUM VII. ECHINODERMATA 



176 

 181 



183 

 185 

 185 

 186 



189 



Class I. ASTEROIDEA . . 198 

 Class II. OPHIUROIDEA . .199 

 Class III. ECHINOIDEA . 202 



Class IV. HOLOTHURIOIDEA 205 

 Class V. CRINOIDEA . . .208 



PHYLUM VIII. ANNELIDA 



Class I. ARCHI ANNELIDA . 232 

 Class II. CHJETOPODA . . 233 

 Subclass I. Polychaeta . . 234 

 Order i. PHANEROCEPH- 



ALA , , .236 



215 



236 

 236 

 236 



" 2. MACRODRILI . 236 

 Class III. HIRUDINEA , 236 



Order 2. CRYPTOCEPH- 

 ALA . . 



Subclass II. Oligochaeta . 

 Order i. MICRODRILT 



