METAM0RPH0BI8 OF STAB-FI8R .]:: 



The young or larva has now both »f the body alike. 



At this time two lobes arise from each side of the mouth. 

 These separate from their attachment and form I 

 tiiu't hollow cavities, and by the time the larva attains what 

 ailed the Brachiolaria Btage, the development of the 

 body of the star-fish begins, for these two cai ibse 



qnently develop into two water-tubes. <>n one of I 

 cavities the back of the star-fish is afterward develo 

 while on the other the underside with thi acles 



1 





' 



arise. The fully-grown larva is called a brachiolaria, as it 

 was originally described with this name under the im] 

 sion that it was an adult animal. Fig. 45 shows the young 

 star-fish growing in the posterior end of the larva or young, 

 whose body it is now beginning to absorb; finally, the larva 

 body disappears. At this time the star-fish is still minute, 

 conical disk-shaped, with a crenulated edge. In this con- 

 dition it remains probably two or three years before the 

 arms lengthen and the adult form is assumed, 



