lv 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 Echinoderm 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 if 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.” 
