438 



ZOOLOGY 



Fig. 254. — View of Ciona intestinoMs lying on its right side. Both the branchial and 

 the atrial cavities have heen opened by a longitudinal incision to display the in- 

 ternal organs. 



1. Branchial aperture. 



2. Tentacles. 



3. Peribranchial grooves. 



4. Perforated walls of branchial sac. 



5. Eudostyle. 



6. Oesophageal opening leading from the 



branchial sac to the stomach, rather 

 diagrammatic. 



