Asymmetry in the Plutei of Echinus miliaris. 



169 



Fig. 1. — Ventral view of a reversed larva of Echinus miliaris, eleven days old ; drawn 

 from life, x 100. am, amniotic invagination ; hr, body-rod partly degenerated ; 

 ep, ciliary epaulettes ; hy, hydrocoele. 



Fig. 2. — Young of Echinus miliaris metamorphosed from reversed larva, seen from 

 actinal side ; thirty-two days old, and shortly after metamorphosis ; mouth not yet 

 open ; drawn from life. x 100. sp-^, thick pointed spines ; sp^, square-ending 

 spines ; t^, primary tentacles ; t^, first paired tentacles. 



