454 MORGAN. 



DESCRIPTION OF PLATE XXVI. 



Fig. 33. Section through Fig. 6, posterior to mouth, and cutting oesophagus and 



enteroccel. See line 33, Fig. 6. 



Fig. 34. Section of same series in middle of larva. See line 34, Fig. 6. 



FlG. 35. Section in same series through last pair of body cavities. See line 35, 

 Fig. 6. 



Fig. 36. Section at right angles to last, and cutting larva from right to left. Only 



part of the section figured. 



Fig. 37. Section of larva, same age, showing connection of oesophagus with 

 stomach. 



Fig. 38. Section through anterior wall of stomach in mid-ventral line. 



Fig. 39. Longitudinal section of wall of embryo. 



Fig. 40. Longitudinal section in antero-posterior plane through a larva immedi- 

 ately after metamorphosis. 



FlG. 41. Section through second gill pouch of larva of same age as Fig. 40. 



