8 



CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



Echinoidea — Continued 

 Key to Species . 



Arbacia punctulata . 



Strongylocentrotus drobachiensis 



Echinarachnius parma 



Mellita pentapora 

 Holothuroidea 

 Structure . 

 Habits and Food 

 Autotomy . 

 Regeneration 



Reproduction and Development 

 Key to Species 



Cucumaria pulcherrima 



Thyone briareus 



Thyone unisemita 



Thyone scabra 



Synapta inhaerens 



Synapta roseola 

 Bibliography . 



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 I07 

 I08 

 HO 

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"4 



122 



125 

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 I30 



133 



135 

 I36 



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144 



