CONTENTS. 



Page. 



Ecological study of aquatic midges and some related insects with special reference 

 to feeding habits. By Adelbert L. Leathers. (Document No. 915, issued May 26, 

 1922.) i-° 2 



Experiments in the culture op fresh-water mussels. By Arthur Day Howard. (Docu- 

 ment No. 916, issued May 12, 1922.) 63-90 



Further notes on the natural history and artificial propagation of the diamond- 

 back terrapin. By R. L. Barney. (Document No. 917, issued April 24, 1922.) 91-na 



Notes on habits and development of eggs and larvae of the silversides Menidia menidia 

 and Menidia beryllina. By Samuel F. Hildebrand. (Document No. 918, issued April 

 25, 1922.) 113-120 



Deductions concerning the air bladder and the specific gravity of fishes. By Harden 



F. Taylor. (Document No. 921, issued April 24, 1922.) 121-126 



Biology and economic value of the sea missel Mytii.is edulis. By Irving A. Field. 



(Document No. 922, issued July 11, 1922.) 127-260 



A new bacterial disease of fresh-water fishes. By H. S. Davis. (Document No. 924, 



issued August 4, 1922.) 261-280 



The spiny lobster, Panulirus argus, of Southern Florida: Its natural history and 

 utilization. By D. R. Crawford and W. J. J. De Smidt. (Document No. 925, issued 

 August 4, 1922.) 281-310 



Some embryonic and larval stages of the winter flounder. By C. M. Breder, Jr. (Doc- 

 ument No. 927, issued August 4, 1922.) 3 II_ 3 10 



The salmon of the Yukon River. By Charles H. Gilbert. (Document No. 928, issued 



November 21, 1922.) 3 J 7 _ 33 2 



General index 333~34i 



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