xvi ECHINODERMATA 553 



tentacles protruded, and the young Crinoid begins to feed. The 



ax.t 



sens 



FIG. 408. -Fixed larva of Antedon rosacea in which the vestibule is open but in which 

 no trace of the arms lias yet appeared. (After Carpenter. ) 



Letters as in previous figures, sens, sense-organ on tentacle. 



outer wall of the vestibule splits into five valves (r.v, Fig. 408), each 



