THE
CAMBRIDGE NATURAL HISTORY
EDITED BY
S. F. HARMER, M.A., Fellow of King's College, Cambridge; Superintendent of the University Museum of Zoology
AND
A. E. SHIPLEY, M.A., Fellow of Christ's College, Cambridge; University Lecturer on the Morphology of Invertebrates
VOLUME II
FLATWORMS AND MESOZOA
By F. W. Gamble, M.Sc. (Vict.), Owens College