prpost.o. 



pr.post.o ^ pr.ojitlat. 



pr.post.o. 



Fi^.I. 



prposi. d^rs. 



prpost.ciors. 



Larva of Ecliinus esculentus 

 4 weeks old. 



Larva of Echinus esculentus 



3 weeks old. 



KHuth.LitHEdin^ 



