THE AXIAL GRADIENTS IN HYDROZOA. 



415 



hydranths slightly larger than much shorter pieces but this 

 difference is slight at best and in no wise proportional to the 

 great differences in length of such pieces. 



TABLE III. 



DIMENSIONS OF REGENERATED ORAL HYDRANTHS WITH REFERENCE TO LENGTH 



OF PIECE. 

 Length in millimeters; other figures units of ocular micrometer. 



