Transcriber’s Note:

New original cover art included with this eBook is granted to the public domain.

THE
CAMBRIDGE NATURAL HISTORY

EDITED BY

S. F. HARMER, Sc.D., F.R.S., Fellow of King’s College, Cambridge; Keeper of the Department of Zoology in the British Museum (Natural History)

AND

A. E. SHIPLEY, M.A., Fellow and Tutor of Christ’s College, Cambridge; Reader in Zoology in the University

VOLUME IV

MACMILLAN AND CO., Limited