J2_- 



A STUDENT'S TEXT-BOOK 



OF 



ZOOLOGY 



BY 



ADAM SEDGWICK, M.A. F.R.S. 



FELLOW AND FORMERLY TUTOR OF TRINITY COLLEGE, CAMBRIDGE, AND 

 PROFESSOR OF ZOOLOGY AND COMPARATIVE ANATOMY IN THE UNIVERSITY. 

 PROFESSOR OF ZOOLOGY (ELECT) AT THE IMPERIAL COLLEGE OF SCIENCE AND TECHNOLOGY 



VOL. Ill 



THE INTRODUCTION TO ARTHROPODA, THE 

 CRUSTACEA, AND XIPHOSURA, 



By J, J. LISTER, M.A. F.R.S. 



FELLOW OF ST. JOHN'S COLLEGE 



THE INSECTA AND ARACHNIDA 



By A. E. SHIPLEY, M.A. Hon. D.Sc. Princeton, F.R.S. 



FELLOW OF CHRIST'S COLLEGE AND READER OF ZOOLOGY IN THE UNIVERSITY 



LONDON 



SWAN SONNENSCHEIN AND CO. LTD 



NEW YORK: THE MACMILLAN CO. 

 1909 



