292 



ERNEST WAKBEN. 



an area may sometimes correspond to two cells instead of one 

 will not affect the relative resnlts. 



The maximum diameters of a row of twelve areas were 

 measured, and about the fifth row from the ventral edge of 

 the carapace was selected in every case. The results of the 

 measurements are shown in the following- table ; the means 

 of the twelve measurements are y'iven in the second column. 



A similar relationship between the size of the body and the 

 size of its constituent cells was exhibited by some specimens 

 of Leptodora which had been mounted whole in glycerine. 



Length of Leptodora 

 in millimetres. 



•6 

 2-6 

 5-0 



^lean of twelve epidermal cells from 

 first joint of endopodite of Ant. ii. 

 Diameter of Diameter of 



cell. nucleus. 



51 ... 1-7 



9-4 ... 2-4 



12-2 



1 



