268 KINGS LEY. 



EXPLANATION OF PLATE XIII. 



Fig. 83. Horizontal section, Stage I, to show the relations of the mesenteron 

 and lobes of the hepatopancreas. 



Fig. 84. Transverse through an embryo of Stage L, to show the conversion of 

 yolk cells into the epithelium of the alimentary canal. 



Fig. 85. Longitudinal section through the junction of stomodseum and mesen- 

 teron, Stage L, before the connection of the lumens, to show the transformation 

 of yolk cells into the columnar epithelium of the midgut. 



Fig. 86. Late Stage L showing the first hepatopancreatic duct. 



Fig. 87. Late Stage L through the third pair of appendages. 



Fig. 88. Longitudinal section through the oldest larva studied, showing the 

 junction of mesenteron and proctodseum. The section was not quite median and 

 hence cuts off the folds in the proctodaeal region. 



Fig. 89. Section of a leg, Stage L, to show the nerve surrounded by the 

 artery. 



