XX 



SCHEME OF THE CLASSIFICATION 



PAGE 



Order 2. ALCYONACEA . 139 



" 3. GORGONACEA . 139 



" 4. PENNATULACEA 140 



Subclass II. Zoantharia . .141 



Order i. EDWARDSIIDEA 141 



PAGE 



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 . 



a 3. POLYCLADIDA 



. 155 Class II. TREMATODA 



. 156 Order i. MONOGENEA 



156 " 2. DIGENEA . 



. 157 Class III. CESTODA . 



PHYLUM VI. NEM ATHELMINTHES . 



. 145 



. 150 



157 

 . 161 



. 161 

 . 163 



. 169 



GROUPS OF INVERTEBRATES OF MORE OR LESS 



UNCERTAIN SYSTEMATIC POSITION 



Group i 

 u 



u 



MESOZOA . . . 



2. NEMERTINEA 



3. NEMATOMORPHA 

 4- ACANTHOCEPHALA 

 5. CH^TOGNATHA . 



176 Group 6. ROTIFERA 



177 " 7. BRYOZOA . . 



179 " 8. PHORONIDEA 



1 80 " 9. BRACHIOPODA 

 180 " 10. GEPHYREA 



176 



181 



183 

 185 

 185 

 1 86 



PHYLUM VII. ECHINODERMATA 



Class I. ASTEROIDEA 

 Class II. OPHIUROIDEA 

 Class III. ECHINOIDEA 



189 



198 Class IV. HOLOTHURIOIDEA 205 



199 Class V. CRINOIDEA . . .208 

 202 



PHYLUM VIII. ANNELIDA 



Class I. ARCHI ANNELIDA . 



Class II. CHJETOPODA . . 



Subclass I. Polychseta . . 



Order i. PHANEROCEPH- 



ALA 



232 Order 2. CRYPTOCEPH- 



233 ALA . . 



234 Subclass II. Oligochaeta . 



Order i. MICRODRILI 

 236 " 2. MACRODRILI 



Class III. HIRUDINEA 



, 215 



236 

 236 

 236 

 236 

 236 



