Somo Phc'iiomcna nf Hegoneration in XJmnodrilus and related Fornis. 395 



Table IL 



IX-X 



Dead 



two weeks. However, the great discrepancy between the amounts 

 regenerated in the first two weeks and in the last two is particularly 

 noticeable. This is especially true for Lumhriculus in which form in 

 threc-fourths of the cases the amouiit regenerated in the first two 

 weeks was at least four times that regenerated in the last two 

 weeks. As a matter of fact many of the pieces regenerated a far greater 

 amount in the first two weeks. The difference is not so great in Lim- 

 nodrilus but even in it in over one half the cases the rate of regene- 

 ration is almost twice as rapid in the first two weeks as in the last two, 

 indeed at levels from the posterior region it is more than twice as 

 rapid. Exceptions to what has been said occur in pieces that regene- 

 rated little or no tissue during the first two weeks; under these con- 

 ditions the amount regenerated in the last two weeks exceeded that 

 of the first two weeks. 



The tables likewise show limitatious in the size of a piece from 



