PLATE 2. 



Fig. 2. 



Transverse sections of an embryo of Aciinthias vntgtiris, 

 21 m.ni. in length. Fio. I shows one germinal nidus (ridge) with 

 secondary germ-cells ; these are in the normal position. There 

 is a " nest " of secondary germ-cells at the base of the mesentery, 

 these are abnormally placed. 



Fig. 2 shows two (?) secondary germ-cells attached (" stuck 

 on") to the peritoneum of the gut: such abnormally placed 

 germ-cells are of frequent occurrence (Photos by W. T. H.) 



