PLATE 2 



EXPLANATION OF FIGURES 



5 An early stage in the development of a tumor in the proventriculus ganglion 

 located between the brain and the proventriculus. 



6 An early stage in the development of the abdominal tumor showing 

 increase in the number of cells and a tendency to push the pigment cells toward 

 the periphery. 



7 Cells of the salivary glands loaded with pigment. 



8 Initial stage in the production of pigment in a group of cells underneath 

 the pericardial septum. 



526 



