at the tima of its origin it is symmetrically dis- 

 posed on either side of the piano of larval bilateral 

 symmetry. 



GOTO (£*) has shown that the hypogastric entero- 

 coele in the ctar-fishes is not formed from the left 

 alone byt in it are to be found the left and the 

 greater yor% of the right posterior enterocoeles. 



The cellular plug , which in "A" fills the arch- 

 enteric cavity, becomes divided by the furrow which 

 separates the archenteron into enterocoele and stom- 

 ach and a part of it becomes enclosed in the cav- 

 ities of :ach of these structures. Fi 2» 5 C P« 



