THE 
CAMBRIDGE NATURAL HISTORY 
EDITED BY 
3. F. HARMER, Sc.D., F.R.S., Fellow of King’s College, Cambridge ; 
Superintendent of the University Museum of Zoolog 
AND 
A. E. SHIPLEY, M.A., Fellow of Christ’s College, Cambridge ; 
University Lecturer on the Morphology of Invertebrates 
VOLUME IX 
