1246 FISHERIES OF THE UNITED STATES. [92] 



Whitefish. — Goregonus clupeiformis (Mitch.) Milner — Continued. 



was prepared. U. S. Fish Commission. A series of eggs in glyce- 

 rine, showing daily development of the embryo from a month 

 alter the impregnation of the egg to the time of hatching, cov- 

 ering a period of eighty-three days. 



Lake trout. — Salvelinus namaycush (Penn.) Goode. 



Ova. Eggs taken in Lake Erie, near Detroit, Mich., and shipped 

 to central hatching station, Washington, D. C, where the 

 series was put up. TJ. S. Fish Commission. A series of eggs 

 in glycerine, showing daily development of the embryo from a 

 month after impregnation to the time of hatching, covering a 

 period of fifty days. 



FISH ILLUSTRATING THE GROWTH OF THE FRY. 



Brook trout. — Salvelinus fontinalis (Mitchill), Gill & Jordan. 



Beared at U. S. trout ponds at Northville, Mich. Frank 1ST. Clark, 

 superintendent. A series showing the growth of the young at 

 intervals from the newly hatched fish to the three-year-old 

 trout. 



Eainbow trout. — Salmo irideus, Gibbons. 



Seared at U. S. trout ponds at Northville, Mich. Frank N. Clark,, 

 superintendent. A series showing the growth of the young at 

 intervals from the newly hatched fish to the trout two years 

 and a half old. 



Schoodic salmon. — Salmo salar, Linn, subsp. sebago. 



Eeared at U. S. trout ponds at Northville, Mich. Frank N. Clark ? 

 superintendent. A series showing the monthly growth of the 

 young for nine months. 



Salmon. — Salmo salar, Linn. 



Fish probably a year old. New York Fish Commission, Seth 

 Green, superintendent. 



Common eel, — Anguilla rostrata, (Le S.) De Kay. 



Young. October 17, 1877. 20,684. U. S. Fish Commission. This 

 species has a wide geographical range. It spawns in most of 

 the larger streams and in the brackish waters along the coast 

 in the fall, the young eels being seen in immense numbers the 

 following spring. 



Herring. — Clupea harengus, Linn. 



Young, two days old. Grand Manan Island, N. B. 10,470. 



Herring. — Glitpea harengus, Linn. 



Young, three days old. Grand Manan Island, N. B. 10,46 L. 



