108 
THE VOYAGE OF H.M.S. CHALLENGER. 
stations. nd their general distribution so far as made known by the Challenger researches. 
Tin distribution of each species is given in full only under the first station at which it 
was t k -n, and in the case of previously-described species the geographical distribution 
is indicated only so far as discussed in the Challenger Reports. In many of the 
its "f animals from dredge and trawl will be found species belonging to intermediate 
or even surface waters ; if an opinion be expressed by the author of the special report 
as to the habitat of the species, it is indicated in brackets after the name of the species. 
The lists tine prepared from the special Zoological Reports were compared with the 
lists of animals entered in the Station Book by the naturalists on board ship, and a 
special note is mad< of any specimens which may not have reached the specialists owing 
to their mutilated condition or from some other cause. 
A short paragraph in heavy type states the number of specimens and species of 
Metazoa procured at each station by means of the trawl or dredge, the number belonging 
to new genera and species, and the number of these species not obtained elsewhere by 
the Expedition. Should the manuscript journals and note-books contain any remarks 
on the organisms which seemed to be of interest, these have been extracted ; when 
not taken from my own journals the remarks are always placed within inverted commas, 
and the name of the authority attached to the extract. Interpolations in square brackets 
; indicate the names now in use for genera and species otherwise designated by the 
naturalists in their journals on board ship. 
At a large number of stations representative of the different areas and depths, lists 
are given of the shells, frustules, and skeletons of Pteropods, Heteropods, Foraminifera, 
Radiolaria, and Diatoms found in the deposits. In the case of the Foraminifera, those 
species which are pelagic are indicated by a cross x , for these shells often make up more 
than 80 per cent, of the carbonate of lime present in the deposit. 
Under the heading of Surface Organisms very complete lists of the Diatoms, Fora- 
rninifera, Radiolaria, Ccelenterates, Vermes, Crustacea, pelagic Molluscs and Fishes 
captured near the surface are occasionally given, but, as a rule, the notes here inserted 
arc those entered in the journal on the evening of the day on which the observations were 
made. On every available opportunity tow-nets were dragged through the surface and 
ub-.-urface waters of the ocean, and were occasionally sent down to great depths. When 
these net were hauled on board their contents were subjected to microscopic examina- 
:ion by the. naturalists, and the general characters of the organisms, with special notes 
regarding any interesting species, entered in the journals. Frequently, when the weather 
was favourable, a boat was lowered, and one or more of the naturalists examined the 
suii . water by means of water-glasses, hand-nets, tow-nets, and other appliances, and 
note.-* on observations of this kind conclude the descriptions. 
