U S B. F. Bulletin No. 18. 
Figure 1. Terrebonne and Timbalier Bays, Louisiana. Lines indicate isohalines in February-March, 1934. Black circles show percent of dead oysters at various stations observed by H. F. Pry therch in 1933. Squares indicate location of oil wells. 
143870-35. (Face p. 148) 
