PLATE 2. 



EXPLANATION OF FIGURES 



5 Eye of A. punctatum showing the iris divided into two sections, in a very- 

 early larval stage (about two weeks after hatching). The inner section is pure 

 yellow and does not contain melanophores. Magnification (?). 



G Eye of A. punctatum about 2 months after the animal was set on land con- 

 dition. The iris appears dark brown and contains only a few yellow chromato- 

 phores. Magnification (?). 



294 



