PLATE XVII. 



Fig. 1. Newly hatched larval Flounder, Pleuronectes flesus. E. E. 

 Prince. 



2. Larval ditto, 11 days old. April 26, 1886. E. E. Prince. 



3. Post-larval ditto, pelagic. A. T. M. 



4. Young ditto, bottom stage. (Two earlier stages are shown on 



Plate XVI.) C. J. Petersen. 



5. Young ditto, showing the tissues viewed by transmitted light. 



E. E. Prince. 



6. Young ditto \ 



showing the successive changes in pigmenta- 



7. Young ditto } 3 



tion during confinement. IL. rL. Prince. 



8. Young ditto / 



