EAKLY LIFE HISTORY OF CORALS 65 



moves forwards, and it is by means of the cilia that the 

 movements of rotation, that some larvae possess, are carried 



Fig. 7. 



Larval ForiMS of Corals : Condition shortly after Extrusion. 

 (After Duerden.) 



out. The larva moves along with the site of the future mouth 

 pointingbackwards, and in those larvae whose form is pear-shaped 



Fig. 8. 



Larval Forms of Corals. 



No. 1. Larva of Favia fragum, Esper., about ten days old, but still 



free-swimming. 



No. 2. Larva of Favia fragum, Esper., about a week after settling. 



(After Duerden.) 



it is usually the broad end that leads the way. On extrusion 

 and after a few moments of quiescence, the larvse watched in 

 aquaria have been noticed to begin to swim about actively, 



