BARNACLE GEESE GOOSE BARNACLES. 311 



head. In this state it swims freely, and with great activity. 

 It undergoes three moults, each time altering its figure, 

 until at the third exuviation it has become enclosed in a 



FIG . 43. WHALE BARNACLE (Coronula diadema), WITH THREE 



Conchoderma aurita ATTACHED TO IT. 



bivalve shell, and has acquired a second eye. .It is now 

 ready to attach itself to its abiding-place ; so, selecting its 



