CRUSTACEA 



By GEOFFREY SMITH, M.A. (Oxon.), Fellow of New Colk.L 

 and the late W. F. R. WELDOX, M.A. (D.Sc., Oxon.), i< I , ll,,\\ 



of St. John's College, Cambridge, and Linucre Professor nf llinnan 

 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 Colli 

 Cambridge ; Reader in Zoology 



EURYPTERIDA 



By HENRY WOODS, M.A., St. John's College, Cambiidu- : University 

 Lecturer in Palaeozoology 



SCORPIONS, SPIDERS, MITES, TICKS, ETC. 



By CECIL WARBURTON, M.A., Christ's College, Canil>ml-< : Zooli 

 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 



?>y A. E. SHIPLEY, M.A., F.R.S., Bellow and Tutor ol Chri 

 Cambridge ; Reader in Zoology'' -^ 



PYCNOGONIDA 



l!y D'ARCY W. THOMPSON, C.U., M.A.; Trinity Collef 

 Professor of Natural History in University College, Dundee 



MACMTLLAN AND CO., 

 ST. MARTIN'S STREET, LONDO> 



1909 



