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. 



17. Whitefish egg, showing twin discs, 13 days old. 18. Whitefish egg, showing twin discs, 15 days old. 



DEVELOPMENT OF THE WHITEFISH EMBRYO. 



