Returning to the hydrocoele we rind it a horse- 

 Figs. 6 and 7.hy, 

 shoe shaped structure astride the os ;..The ' 



bulging areas which are to form the radial canals 

 of the adult, are much longer and more regalar in size 

 than in "B" . The radial pouch which lies to the right 

 of the oesophagus and at the 5nd of the right horn 

 of the horse-she; will here after be spoken of as 

 radial canal 1. since it arises from that part of the 

 hydrocoele which was first to bud out from the post- 

 erior =nterocoele .The other radial canals, passing 

 to the left over the oesophagus ,will be designated 

 as 2.3.4 and 5. Radial canal 5 lies in this stage 

 over the opening of the stone canal. 



The rotation of the hydrocoele around the oe- 

 sophagus from its original left position ^which was 

 begun in "Byhas continued to such an extent in "C" 

 that half of it lies to the right of; the median sag- 

 ittal plane of the larva and half to the left .Radial 

 canal 3. lies in this plane and pointd directly toward 

 the anterior end of the larva. n<j. g. 



With its rotation the hydrocoele also moves 

 bodily toward the posterior end of the larva carry- 

 ing with it the oesophagus . The- oesophagus y coming 

 in contact with the anterior Wall of the united post- 



