Some PhorionuMiii <if Rim-iicratitui in Liinnodriliis aiul icl.ilccl Foiins. 435 



In all cases it was found tliat the inetainorplioscd arca of ecto- 

 clerin was centered aboiit the ncoljlasts. Tlic neohla.sts were either 

 in contact with or eise in close ))n)xiruity to the nietamorphosed ecto- 



Textfigure 2. 

 Tliis is a conseciitive series of caniera lucida drawiiiKs sliowing the rclation betwcen the meta- 

 inorphosed eetoderm cells and the neoblasts. Follow the figures from top to bottoni of the 

 left hand coliimn and then from top to bottom of the right band cohinin. Cell outlhus are not 

 shown; only the outlincs of the nuclei with tlicir n\irler.li are given. The horiztintal lines in- 

 dicatc the liniits of the ectoderm; tlie irregulär outline beneath the ectoderm shows the liniits 

 of the neoblasts. The group of longitudlnal lines in the throe upper figures of the left hand 



column reprcsc'iit tjic nerve. 



derni cells and of these cells those that iiiost nearly ros(Mnblo n('()])lasts 

 were always nearest the neoblasts. 



The objection may be raised that, except in the case of ono indivi- 

 dual; the evidence adduced has to do only with instaiices in which 

 neoblasts are found about tho metamorpliosod cctodonn cells. It is 



