The Editor of the Challenger Reports will be greatly obliged to 
Authors sending him copies of separate papers, or references to 
works, in which the Challenger discoveries are referred to, or the 
observations of the Expedition are discussed. 
This will greatly facilitate the compilation of a complete Biblio- 
graphy, and the discussion of the results of the Expedition, in the 
final Volume of the Series. 
Letters and Papers should be addressed — 
JOHN MURRA F, 
Chau.enger Office, 
J2 Queen Street, 
EDINBURGH, 
