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CONTENTS 
Page 
Migrations and other phases in the life history of the cod off southern New 
England. By William C. Schroeder. (Document No. 1081, issued September 9, 
1930.) 1-136 
Investigations on plankton production in fish ponds. By A. H. Wiebe. (Docu- 
ment No. 1082, issued August 11, 1930.) 137-176 
Salmon-tagging experiments in Alaska, 1929. By Seton H. Thompson. (Document 
No. 1084, issued September 15, 1930.) 177-195 
An experimental study in production and collection of seed oysters. By P. S. 
Galtsoff, H. F. Prytherch, and H. C. McMillin. (Document No. 1088, issued Novem- 
ber 26, 1930.) 197-263 
Commercial snappers (Lutianidae) of Gulf of Mexico. By Isaac Ginsburg. (Doc- 
ument No. 1089, issued November 6, 1930.) 265-276 
' A biological study of the offshore waters of Chesapeake Bay. By R. P. Cowles. 
(Document No. 1091, issued December 26, 1930.) 277-381 
. Development and life history of fourteen teleostean fishes at Beaufort, N. C. 
By Samuel F. Hildebrand and Louella E. Cable. (Document No. 1093, issued 
December 26, 1930.) 383-488 
Oxygen consumption of normal and green oysters. By Paul S. Galtsoff and Dorothy 
V. Whipple. (Document No. 1094, issued January 13, 1931.) 489-508 
The blood of North American fresh-water mussels under normal and adverse 
conditions. By M. M. Ellis, Amanda D. Merrick, and Marion D. Ellis. (Docu- 
ment No. 1097, issued February 17, 1931.) 509-542 
Relative growth and mortality of the Pacific razor clam (Siliqua patula, Dixon) 
and their bearing on the commercial fishery. By F. W. Weymouth and H. C. 
McMillin. (Document No. 1099, issued February 26, 1931.) 543-567 
Natural history of the bay scallop. By James S. Gutsell. (Document No. 1100, 
issued February 24, 1931.) 569-632 
The age and growth of the Pacific cockle (Cardium corbis, Martyn). By F. W. 
Weymouth and Seton H. Thompson. (Document No. 1101, issued March 16, 1931.). _ 633-641 
Statistical review of the Alaska salmon fisheries. Part II: Chignik to Resur- 
rection Bay. By Willis H. Rich and Edward M. Ball. (Document No. 1102, 
issued March 19, 1931.) 643-712 
Annual growth of fresh-water mussels. By Thomas K. Chamberlain. (Document 
No. 1 103, issued March 31, 1931.) 713-739 
General index 741-749 
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