AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 513 
and suggested that it had possibly been carried out from northern seas by attaching 
itself to the hull of the vessel. Though marine crustacea doubtless are occasionally 
dispersed in this way by ships, we now know that Jassa falcata is a cosmopolitan 
species, and its occurrence in Kerguelen Island can therefore be otherwise accounted 
for. It has been pointed out by Mr G. M. Tuomson and myself that the animal often 
temporarily attaches itself to the carapace of large crustacea, such as Jasus edwardsu 
Hutton, and probably its dispersal is assisted in this way. 
The brief notice I have given above gives only a faint idea of the complex forms of 
this species and of the changes it passes through. These forms and its full life history 
are being worked out by Mrs Sexron and others at the Marine Laboratory, Plymouth, 
and I have been greatly assisted in the identification of my specimens by the com- 
munication of some of the results already obtained but not yet fully published. 
Genus CapRELLA Lamark, 1801. 
Caprella exquilibra Say. 
Caprella xquilibra Say, 1818, p. 391. 
5 - Mayer, 1903, pp. 75, 89, pl. iii. figs. 29-34, pl. vii. figs. 66-69. 
. »  Stebbing, 1910s, p. 466. 
South Africa, entrance to Saldanha Bay, Station 483; trawl, 25 fathoms. 
2ist May 1904. One immature male. 
The specimen is not fully mature, but I think undoubtedly belongs to this widely 
distributed species. 
It is worthy of note that this is the only Caprellid taken during the expedition, 
and that the family seems to be quite absent from the Antarctic fauna, and only very 
poorly represented in the sub- Antarctic. 
Genus Hyprria Latreille and Desmarest, 1823. 
Hyperia gaudichaudu Milne Edwards. 
Hyperia gaudichaudzi Milne Edwards, 1840, vol. iii. p. 77. 
3 e Stebbing, 1888, p. 1394, p. 169. 
5 Walker, 1907, p. 7. 
Falkland Islands, Stanley Harbour, Station 118; ‘ectoparasitic on jelly-fish.” 
7th January 1903. Several males, females, and young; the largest female 
being 15 mm. long. 
Station 541; 87° 41’ N., 29° 25’ W., surface; hand-net. 3rd July 1904. 
“Associated with Aurelia caught at the same time.” Two males. 
Station 112; surface, lat. 46° 3’S., long. 56° 30’ W. 3rd January 1903. Many 
specimens, all of small size, the largest 6 mm. 
These specimens all seem undoubtedly to belong to this widely distributed species, 
which has already been recorded from Antarctic regions by Mr WaLKER. 
