AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 231 



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. THOMSON and myself that the animal often 

 temporarily attaches itself to the carapace of large Crustacea, such as Jasus edwardsii 

 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 SEXTON 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 sequilibra Say. 



Caprella xquilibra Say, 1818, p. 391. 



Mayer, 1903, pp. 75, 89, pi. iii. figs. 29-34, pi. vii. figs. 66-69. 



Stebbing, 1910B, p. 466. 



South Africa, entrance to Saldanha Bay, Station 483 ; trawl, 25 fathoms. 

 21st 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 HYPERIA Latreille and Desmarest, 1823. 

 Hyperia gaudichaudii Milne Edwards. 



Hyperia gaudichaudii Milne Edwards, 1 840, vol. iii. p. 77. 

 Stebbing, 1888, p. 1394, p. 169. 



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; 37 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. 



(ROT. soc. EDIS. TRAXS., VOL. XLVIIL, 513.) 



