CRUSTACEA 



By GEOFFREY SMITH, M.A. (Oxon.), Fellow of New College, Oxford; 

 and the late W. F. R. WELDON, M.A. (D.Sc., Oxon.), formerly Fellow 

 of St. John's College, Cambridge, and Linacre Professor of Human 

 and Comparative Anatomy, Oxford 



TRILOBITES 



By HENRY WOODS, M.A., St. John's College, Cambridge ; University 

 Lecturer in Palaeozoology 



INTRODUCTION TO ARACHNIDA, AND 

 KING-CRABS 



By A. E. SHIPLEY, M.A., F.R.S., Fellow and Tutor of Christ's College, 

 Cambridge ; Reader in Zoology 



EURYPTERIDA 



By HENRY WOODS, M. A., St. John's College, Cambridge ; University 

 Lecturer in Palaeozoology 



SCORPIONS, SPIDERS, MITES, TICKS, ETC. 



By CECIL WARBURTON, M.A., Christ's College, Cambridge ; Zoologist 

 to the Royal Agricultural Society 



TARDIGRADA (WATER-BEARS) 



By A. E. SHIPLEY, M.A., F.R.S., Fellow and Tutor of Christ's College, 

 Cambridge ; Reader in Zoology 



PENTASTOMIDA 



By A. E. SHIPLEY, M.A., F.R.S., Fellow and Tutor of Christ's College, 

 Cambridge ; Reader in Zoology 



PYCNOGONIDA 



By D'ARCY W. THOMPSON, C.B., M.A., Trinity College, Cambridge; 

 Professor of Natural History in University College, Dundee 



MACMILLAN AND CO., LIMITED 



ST. MARTIN'S STREET, LONDON 



1909 



