PERIOD OF CUVIER. 317 



CL. 7. OCTOPODA. (Arachnida.) 



CL. 8. DECAPODA. (Crustacea, Decapoda, and Limulus.) 



CL. 9. HETEROPODA. (Squilla, Entoiuostraca, and Epizoa.) 



CL. 10. TETRADECAPODA. (Amphipoda and Isopoda.) 



CL. 11. MYRIAPODA. 



CL. 12. CHJETOPODA. (Annelides.) 



CL. 13. APODA. (Hirudo, Cestoidea, Ascaris.) 



Third Type: MALENTOZOARIA. 



CL. 14. NEMATOPODA. (Cirripedia.) 

 CL. 15. POLYPLAXIPHORA. (Chiton.) 



Fourth Type : MALACOZOARIA. (Mollusca.) 



CL. 16. CEPHALOPHORA. Dioi'ca (Cephalopoda and Gastero- 

 poda, p. p.), Hermaphrodita and Monoica (Gastero- 

 poda reliqua). 



CL. 17. ACEPHALOPHORA. Palliobranchia (Brachiopoda), La- 

 mellibranchia (Acephala), Heterobranchia (Ascidiae.) 



2. Sub- Kingdom. Actinomorpha or Actinozoaria . Form radiate. 



CL. 18. ANNELIDARIA, or Gastrophysaria (Sipunculus, etc.) 



CL. 19. CERATODERMIA. (Echinodermata.) 



CL. 20. ARACHNODERMARIA. (Acalepha;.) 



CL. 21. ZOANTHARIA. (Actiniae.) 



CL. 22. POLYPIARIA. (Polypi tentaculis sknplicibus), (An- 



thozoa and Bryozoa.) 

 CL. 23. ZOOPHYTARIA. (Polypi tentaculis compositis), Hal- 



cyonoidea.) 



3. Sub-Kingdom. Heteromorpha or Heterozoaria. Form irregular. 



CL. 24. SPONGIARIA. (Spongias.) 



CL. 25. MoriADARiA. (Infusoria.) 



CL. 26. DENDROLITIIARIA. (Corallinse.) 



The classification of De Blainville resembles those of 

 Lamarck and Cuvier much more than a diagram of the 

 three would lead us to suppose. The first of these sys- 

 tems is founded upon the idea that the animal kingdom 

 forms one graduated series ; only that De Blainville in- 

 verts the order of Lamarck, beginning with the highest 

 animals and ending with the lowest. With that idea is 

 blended, to some extent, the view of Cuvier, that animals 

 are framed upon different plans of structure; but so im- 

 perfectly has this view taken hold of De Blainville, that, 



