NARRATIVE OF THE CRUISE. 
845 
Europe and the far-off Kerguelen Island. Again, it is a rare exception to find a free- 
swimming species ranging over a very small district, and the probability is that where 
this appears to be the case, further research will usually reveal its presence throughout a 
larger area ; as illustrative of this fact, Copilia mirabilis was captured in two widely 
distant areas, viz., Polynesia and the Malay Archipelago, and the North Atlantic, off the 
west coast of Africa, Only one free-swimming species ( Euchceta prestandrece) was found 
in all the areas explored by the Challenger, although not a few occurred very frequently. 
The largest numbers of species, leaving out of consideration the fish-parasites, were 
obtained from the North Atlantic, South Atlantic, Eastern Asiatic, and Australasian Seas, 
the numbers from these areas being forty-eight, forty-eight, forty-five, and forty-two 
respectively. 
The only undoubted deep-sea species, and on the whole the most remarkable Copepod 
known, is Pontostratiotes abyssicola, the single specimen of which was picked from the 
dried mud, dredged from a depth of 2200 fathoms, having unfortunately lost many of its 
characters in the drying process ; however, it has been minutely described and carefully 
figured, 1 and is represented in the annexed woodcut (fig. 313). Not only is it peculiar 
in being an abyssal form, but also in its extraordinary spinous armature, a feature 
quite unprecedented in the group. Possibly Hemicalanus aculeatus, Phyllopus 
bidentatus, and one or two species of Euchceta might be reckoned as abyssal species, 
1 Zool. Cliall. Exp., part xxiii. pp. 105, 106, pi. xliv. figs. 1-11, 1883. 
