GERMINAL LOCALIZATION IN THE EGG OF CELEBRAT ULUS. 31 



cells assuming the epitlierial arrangement and the gut behig soon 

 formed. The result is defective pilidia (Fig. 26 J, K). Some 



^^^'^'"nm/Tiin TïTlJlf^ 



Fig. 26. 



A, B, C, D and E, solid cell masses developed from eggs kept in Ca-free 

 sea-water ; F and G, isolated cells, highly magnified, showing cilia formed 

 irregularly on the surface ; H, I, J, K and L, abnormal pilidia produced 

 from solid cell masses after being transferred into ordinary sea-water. 



