grees in the hydrocoele. Radial pouch (l)finallyi 

 after having paseed round the oesophagus, comas to 

 rest at the point where it originated. Radial canal 

 (5) ,it will bo noted, is carried only hair as far as 

 radial canal (l),or from its. point of origin on the 

 left, to a point opposite on the right of the oesoph- 

 agus. Compare Figs.C and 9. 



This great amount of rotation seemed so pe- 

 culiar that I hesitated for seme time to believe it 

 and supposed instead that while the hydrocoele moved 

 to the right, the other organs lying above it rotat- 

 ed an equal amount to the left. 



The early closure of the blastopore and the 

 central position of the mouth in the early stages 

 make such a view as the latter seem possible and as 

 it may suggest itself to those who study Figs.C and 

 7, I will give below the points which seem to me, 

 directly of indirectly, to prove that the hydrocoele 

 revolves under the enteroeoeles and stomach rather 

 than that the latter twists over the hydrocoele. 



a) .The ectodermal bulges, nearer the posterior 

 end in "C" Fig,C. are the same as those nearer the 

 posterior end of "D" Fig.O. on which the third cil- 

 iated band is situated. 



