102 STARFISH, SEA URCHIN, BRITTLE STARS 



CLASSIFICATION OF THE EXAMPLES 



Branch IX — Echinodermata. 

 Class — Asteroidea. 



Order — Cryptozonia. 

 Type of Order. 



Asterias vulgaris — Starfish. 

 Class — Ophiuroidea. 

 Order — Ophiurida. 

 Type of Order. 



Ophioglypha lacertosa — Brittle star. 

 Class — Echinoidea. 

 Order — Regularia. 

 Type of Order. 



Echinus drocbachiensis — Sea urchin. 

 Class — Holothuroidea. 

 Order — Pedata. 

 Type of Order. 



Pentacta frondosa — Sea cucumber. 

 Class — Crinoidea. 



Order — Neo-crinoidea. 

 Types of Order. 



Antedon rosacea — Feather star. 

 Rhizocrinus lojotensis — Sea lily. 



