U. S. B. F.— Dor. 949. 



Fig. 19.— Wliiteflsh egg, sho\viag twin disks, 3 days Fig. 20.— Wliiteflsh egg, showing twin disks, G days 



old. old. 



Fig. 21.— Whitefish egg, showing twin disks, 7 daj's 

 oH. 



Fig. 22.— Wliiteflsh egg, shovring twin disks, 8 days 

 - old. 



Fig. 23.— Wliiteflsh egg, showing twin disks, 13 days Fig. 24.— Wliitofish egg, show ing twin disks, 15 davs 



old. old. 



DEVELOPMENT OF THE WHITEFISH EMBRYO. 



