vui THE VOYAGE OF H.M.S. CHALLENGER. 



tions made during the Expedition. Professor Haeckel has devoted ten years 

 of his life to this work, and this Report sets forth the results of his labours, 

 on the conclusion of which he will be congratulated by all Naturalists. The 

 entire literatare of the Radiolaria (from 1834 to 1884) is completely 

 recorded, and the older species (both living and fossil) redescribed, so that 

 the Report is a complete Monograph, which will be an invaluable aid to 

 all future Investigators. 



"O" 



John Murray 



Challengeu Office, 32 Queen Street, 

 Edinburgh, l.s^ Feiruar;/ 1887. 



