THE 



GROWTH OF GROUPS 



IN THE ANIMAL KINGDOM 



BY 



R. E. LLOYD, M.B., D.Sc. (LOND.) 



INDIAN MEDICAL SERVICE 



PROFESSOR OF BIOLOOY (PRO TEM.) IN THE MEDICAL COLLEGE, CALCUTTA 

 FORMERLY NATURALIST TO THE MARINE SURVEY OF INDIA 



WITH TWO COLOURED PLATES 



LONGMANS, GREEN, AND CO. 



39 PATERNOSTER ROW, LONDON 



NEW YORK, BOMBAY, AND CALCUTTA 



1912 



All rights reserved 



