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



Marenzeller of Vienna. To each and to all I desire to express my hearty appreciation of 

 the courtesy and friendly kindness I received at their hands. 



My warmest thanks are also due to Dr. A. C. L. G. Giinther, the keeper of the Zoolo- 

 gical Department of the British Museum, for the many facilities afforded to me during 

 the progress of my work ; and especially to my friend, Prof. F. Jeffrey Bell, whose constant 

 and ever-ready assistance has placed me under an indebtedness greater than I can adequately 

 express in words. In like manner, my cordial thanks are given to my friend, Dr. P. 

 Herbert Carpenter, whose critical advice and wide knowledge of Eckinoderm literature have 

 always been at my disposal. 



In conclusion, I beg to thank most heartily Dr. John Murray for many acts of kindness 

 and assistance during the progress of my Report, and for the friendly willingness he has 

 always shown to meet my views. My thanks are also due to Mr. Wm. E. Hoyle for the 

 attention and trouble he bestowed on my proof-sheets whilst on the Editorial Staff; and 

 to Mr. James Chumley for similar good offices. 



To the memory of the late Sir Wyville Thomson, under whose direction this work was 

 commenced, I would pay the tribute of sincere and personal esteem, repeating — not inaptly 

 as it seems to me — the words used by the Danish naturalist, Abildgaard, in writing of his 

 friend, the first great dredger, Otho Frederick Miiller, " Loquuntur Eius scripta cum 

 mundo peritura." 



