FIGURE NO. 12 



YOUNG FORM OF ROSY 

 FEATHER-STAR 



[Antedon rosacea] 





Most of the adult feather-stars or sea-lilies (Crinoids) were 

 fixed forms, with the cup and the arms borne on a stalk. The same 

 is true of some of the present-day forms. The common Antedon, 

 however, moves about freely, and can swim by bending its pinnate 

 arms. It is interesting to find that after its free-swimming larval 

 stage is over, the developing Antedon passes through a sedentary 

 phase, here represented. The individual recapitulates racial his- 

 tory. On attaining a certain size the Antedon, still very small, 

 drops off the top of the stalk. 



88 



