U. S. DEPARTMENT OF COMMERCE 
Daniel C. Roper, Secretary 
BUREAU OF FISHERIES 
Frank T. Bell, Commissioner 
EXPERIMENTAL OBSERVATIONS 
ON SPAWNING, LARVAL DEVELOPMENT, 
AND SETTING IN THE OLYMPIA OYSTER 
OSTREA LURIDA 
By A. E. Hopkins 
From BULLETIN OF THE BUREAU OF FISHERIES 
Volume XLVIII 
Bulletin No. 23 
UNITED STATES 
GOVERNMENT PRINTING OFFICE 
WASHINGTON : 1937 
For sale by the Superintendent of Documents, Washington, D. C. 
Price 25 cents 
