8 



RE GENERA TION 



regions to form the lobes of the tail, but the two regions of most rapid 

 growth are very soon established in the new tail. Subsequent growth 

 in all parts of the new tail enlarges it to the full size. 



FIG. 3. A, B. Short head-ends of A.faetida that did not regenerate at posterior surface. C, D, 

 E. Longer anterior pieces, that made new segments at their posterior ends. F. After Hazen. 

 A piece consisting of five (3 to 7) anterior segments grafted, in a reversed position, upon the 

 anterior end of another worm. A heteromorphic head of about two segments regenerated 

 at the free end, which is the posterior end of the piece. 



In some cases of regeneration, in which the new part is at first 

 smaller than the part removed, the new part represents at first only 

 the distal portion of the body, and although the new part may grow 

 to the full size, the whole of the part removed may never come back. 



