



. 





- 





THE 



CAMBRIDGE NATURAL HISTORY 



EDITED BY 



S. F. HAK.MER, Sc.D., F.R.S., Fellow of King's College, Cuml.rid. 

 Keeper >f the Department of Zoology in the British MUM.UIH 

 (Natural History) 



A. E. SHIPLEY, M.A., Fellow and Tutor of Christ's Coll. 

 Cambridge ; Reader in Zoology in the University 



VOLUME IV 



CEP;: OGY 



