PROCEEDINGS 
OF THE 
ROYAL SOCIETY OF LONDON 
SERIES B 
CONTAINING PAPERS OF A BIOLOGICAL CHARACTER 
VOL. LXXXITI. 
LONDON: 
PRINTED FOR THE ROYAL SOCIETY aAnp Soup sy 
HARRISON AND SONS, ST. MARTIN’S LANE, 
PRINTERS IN ORDINARY TO HIS MAJESTY, 
May, 1911. 
