mRUSTACEA 
By GEorrrey Smitu, M.A. (Oxon.), Fellow of New College, Oxford ; 
and the late W. F. R. WeE.Lpon, M.A. (D.Sc.,Oxon.), formerly Fellow 
of St. John’s College, Cambridge, and Linacre Professor of Human 
and Comparative Anatomy, Oxford 
WRILOBITES 
By Henry Woops, M.A., St. John’s College, Cambridge ; University 
Lecturer in Palaeozoology 
INTRODUCTION TO ARACHNIDA, AND 
KING-CRABS 
By A. E. Surpiey, M.A., F.R.S., Fellow and Tutor of Christ’s College, 
Cambridge ; Reader in Zoology 
EURYPTERIDA 
By Henry Woops, M.A., St. John’s College, Cambridge ; University 
Lecturer in Palaeozoology 
Pe ORPIONS, SPIDERS, MITES, TICKS, Ere. 
By Ceci, Warpurton, M.A., Christ’s College, Cambridge ; Zoologist 
to the Royal Agricultural Society 
TARDIGRADA (WATER-BEARS) 
By A. E. Surprey, M.A., F.R.S., Fellow and Tutor of Christ’s College, 
Cambridge ; Reader in Zoology 
PENTASTOMIDA 
By A. E. Surptey, M.A., F.R.S., Fellow and Tutor of Christ’s College, 
Cambridge ; Reader in Zoology 
PYCNOGONIDA 
By D’Arcy W. Tuompson, C.B., M.A., Trinity College, Cambridge ; 
Professor of Natural History in University College, Dundee 
MACMILLAN AND CO, LIMITED 
Sieh LIN'S STREED, LONDON 
1909 
