8 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. 



PAG 



Echinoidea Continued 



Key to Species ....... 106 



Arbacia punctulata . . . . . .107 



Strongylocentrotus drobachiensis . . . 108 



Echinarachnius parma . . . . no 



Mellita pentapora . . . . . .112 



Holothuroidea . . . . . . . 114 



Structure . . . . . . . .114 



Habits and Food . . . . . .122 



Autotomy ........ 125 



Regeneration . . . . . . .126 



Reproduction and Development . . . .128 



Key to Species . . . . . . .129 



Cucumaria pulcherrima . . . . .130 



Thyone briareus . . . . . . 133 



Thyone unisemita . . . . . . 135 



Thyone scabra . . . . . .136 



Synapta inhaerens . . . . . .138 



Synapta roseola . . . . . .141 



Bibliography . . . . . . . . 144 



