Report U. S. F. C 1898. (To face page LXXII. 



Plate XV. 



13. Whitefish egg, showing twin discs, 3 days old 



14. Whitefish egg, showing twin discs, 6 days old. 



15. Whitefish eggs, showing twin discs, 7 days old. 



16. Whitefish eggs, showing twin discs, 8 days old. 



1 7. Whitefish egg, showing twin discs, 1 3 days old. 18. Whitefish egg, showing twin discs, i 5 days old. 



DEVELOPMENT OF THE WHITEFISH EMBRYO. 



