the voyage of h.m.s. challenger. 
xxxviii 
\ t , ^nv stations representative of different regions and depths 
,j' j| lt » , A -e;t :i, verv complete list v of Diatoms, lvadiolaiia, Foiaminifeia, 
aIl ,l Pteropods, are furnished botli from the collections taken in the 
surface— u t>, and from the deposits at the bottom. Had it not been for 
the space they occupy, similar lists might have been inserted from many more 
s; it’r ■ 1 1 s . The lists of Diatoms have, in the great majority of cases, been 
„ - j.li, 1 to me by Mr. Thomas Comber from an examination of the surface 
- ith. rin— and the samples of deep-sea deposits. The lists of Foraminifera 
; , l ; . prepared irom an examination ot my own preparations, and from 
, . ,1 tions ^elected from the desposits by Mr. Frederick Pearcey, assistant to 
i . 1 1 : 1 1 1 : rali st s on board the Challenger, and for several years an assistant in the 
( iiallenger Office, but I have also made use of a manuscript note-book which 
belonged to the late Mr. H. B. Brady. The lists of Radiolaria from the 
surfaer waters and from the deposits have been supplied to me by Professor 
Haeckel and Dr. Drover from a study of the Challenger collections. 
Th.- station summaries are preceded by a historical introduction in which 
1 avc endeavoured to trace, and with the aid of a series of maps to illustrate, 
th,. ideal development of our knowledge concerning the ocean from 
t dnv 1 of history down to the time of the Challenger Expedition. For 
. - u mcc and advice in this portion of the work I desire to acknowledge my 
i h dness t" the lati Professor W. Robertson Smith, to Dr. J. Sutherland 
B 1 ac k. Mr. George Murray, and especially to my colleague Professor A. 
Kmard. in collaboration with whom notes concerning the progress of 
h; . i . .< I, faring on Oceanography were collected seven or eight years ago 
i . >ui joint work on Deep-Sea Deposits; many of these notes have been 
Me u c of iii writing the Historical Introduction to these volumes. 
I - • at "ii summaries are followed by lists setting forth the geographical 
d ithvmetrieal distribution of the animals captured in the various 
trawling- and dredgings. Many theoretical considerations are suggested by 
tl 1 i > t : and the observations set forth in the body of the work, but for 
vari"n- reasons I have in this place merely indicated in the concluding 
paragraphs the nature of some of these interesting speculations. 
T - : : unary account of the observations and scientific results of the 
( b din ■ Expedition is brought to a close by a complete index of the 
ra. sub-genera, species, and varieties of marine organisms captured at 
