Transcriber's note: Text enclosed by underscores is in italics (_italics_).
A single underscore introduces a subscript (CO_2), and a caret a
superscript (B^1).
Page numbers enclosed by curly braces (for example: {25}) have been
incorporated to facilitate the use of the Alphabetical Index and other page
references in the text.
* * * * *
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
[Illustration]
FLATWORMS AND MESOZOA
By F. W. GAMBLE, M.Sc. (Vict.), Owens College
NEMERTINES
By Miss L. SHELDON, Newnham College, Cambridge
THREAD-WORMS AND SAGITTA
By A. E. SHIPLEY, M.A., Fellow of Christ's College, Cambridge
ROTIFERS
By MARCUS HARTOG, M.A., Trinity College, Cambridge (D.Sc. Lond.),
Professor of Natural History in the Queen's College, Cork
POLYCHAET WORMS
By W. BLAXLAND BENHAM, D.Sc. (Lond.), Hon. M.A. (Oxon.), Aldrichian
Demonstrator of Comparative Anatomy in the University of Oxford
EARTHWORMS AND LEECHES
By F. E. BEDDARD, M.A. (Oxon.), F.R.S., Prosector to the Zoological
Society, London
GEPHYREA AND PHORONIS
By A. E. SHIPLEY, M.A., Fellow of Christ's College, Cambridge
POLYZOA
By S. F. HARMER, M.A., Fellow of King's College, Cambridge
London
MACMILLAN AND CO., LIMITED
NEW YORK: THE MACMILLAN COMPANY
1901
_All rights reserved_
'Nous allons faire des vers ensemble'
ANDRÉ DE CHÉNIER
_First Edition 1896. Reprinted 1901_
CONTENTS
PAGE
SCHEME OF THE CLASSIFICATION ADOPTED IN THIS BOOK ix
PLATYHELMINTHES AND MESOZOA
CHAPTER I
TURBELLARIA
INTRODUCTION—DESCRIPTION OF THE POLYCLAD _LEPTOPLANA TREMELLARIS_
—APPEARANCE—HABITS—STRUCTURE: POLYCLADIDA—CLASSIFICATION—HABITS
—ANATOMY—DEVELOPMENT: TRICLADIDA—OCCURRENCE—STRUCTURE
—CLASSIFICATION: RHABDOCOELIDA—OCCURRENCE—HABITS—REPRODUCTION
—CLASSIFICATION 3