SCHEME OF CLASSIFICATION 



Sub-Phylum. 



Class. 



Order. 



Echinoidea 



{contd. ) 



ELEU- 

 THEROZOA1 



(contd.) 



Spatangoidea 



(pp. 529, 549) 



Holothuroidea 



(pp. 431, 560) 



PELMATO- 

 ZOA 



(pp. 430, 579) 



Crinoidea 



(p. 580) 



Thecowea 

 Edrioaster- 



OIDEA 



(pp. 580, 596). 

 Carpoidea 

 (pp. 580, 596). 



CVSTOIDEA 



(pp. 580, 597). 

 Blastoidea 

 I (pp. 580, 599). 



r Aspidochirota 



(p. 570). 

 Elasipoda 



(p. 571). 

 Pelagothuriida 



(p. 572). 

 Dendrochirota 



(p. 572). 

 Molpadiida 



(p. 575). 

 Synaptida 



(p. 575). 



Inabunata 



(p. 595). 

 Articulata 



(p. 595). 



Camerata 



(p. 595). 



Family. 

 Echinonidae (p. 553) 

 Nucleolidae (p. 554) 

 Cassidulidae (p. 554) 

 Ananchytidae (p. 554) 

 Palaeostomatidae 



(p. 554) 

 Spatangidae (p. 554) 

 k Brissidae (p. 556) 

 A rchaeocidaridae 



(p. 557). 

 Melonitidae (p. 557). 

 IHarechinidac (p. 557). 

 Holectypoidea (p. 558). 

 Echinoconidae (p. 558). 

 Collyritidae (p. 559). 



I Afternata 

 j (p. 554). 



StiTiiata 

 (p. 554). 



Hyocrinidae (p. 590). 

 Rhizocrinidae (p. 590). 

 Pentacrinidae (p. 591). 

 Holopodidae (p. 592). 

 Comatulidae (p. 594). 



