TABLE V. 



Systematic Survey of some of the most important rhythmical variations in 



Egg-cleavage. 80 



Only the first column (Amphioxns) presents the original, palingenetio 

 cleavage- hythm, in regular geometrical progression. All the other columns 

 show the descended keuogenetio modifications. 



= parent-cells. s = cleavage-cells. e = exoderm-cells. 



t = entoderm-cells. 



