IDS 



THE AMERICAN NATURALIST [Vol. XLII 



Mr. Charles R, Stockard 4 describes the development of the 

 eggs of the killifish (Fundulus heteroclitus) in a solution of 

 magnesium chloride. 



In this fluid the young fishes develop as one-eyed monsters, 

 the two eyes coalescing into a single median eye. This eye has 

 a single lens. A mixture of sea-water with this solution gives 

 the same effect. The influence of the magnesium salt is there- 

 fore supposed to cause the strange development of the eyes. 



In the Proceedings of the U. S. Nat. Mus., XXXIII, Jordan 

 and Herre describe the cirrhitoid fishes of Japan, describing one 

 new genus, Isobuna. 



In the same proceedings, Jordan and Richardson describe a 

 new killifish, Lucania browni, from a hot spring in Lower Cali- 



In the same proceedings. Eigenmann & Cole record the species 

 of South American Characin fishes in the National Museum and 

 in the Museum of Indiana University, with numerous plates 

 and descriptions of new species. 



In the same proceedings Professor Edwin Linton describes 

 the worms parasitic on fishes of Bermuda. 



In Bureau of Fisheries Document No. 627, Mr. F. M. Cham- 

 berlain records his observations on the salmon and trout of 



Among other matters of interest it is noted that a majority 

 of the young red salmon spend their first winter in the lakes, 

 while the other species leave early for the sea. It is long known 

 that the red salmon never enter a stream that has not a lake 

 in its course and that they always spawn in streams above a 

 lake. The other four species of Alaska salmon have no special 

 relation to lakes. 



Mr. Chamberlain's observations do not confirm the "homing 

 theory." Marked salmon fry from the Naha River appeared 

 as adults at Yes Bay. Most of the fishes however seem to 

 return to the parent stream, from which they probably never 

 wander very far. 



Four years is shown to be the usual age of maturity of king 

 salmon and red salmon, while the humpback is probably adult 

 at an earlier period. 



'Archiv EntwicMungs Mech., XXIII, p. 249. 



