16 A. 0. WALKER. 



not go out during the season of 1902-3, the principal ridge became more than a mile 

 long, the ice being pressed up to a height of twenty or thirty feet at the point of 

 greatest pressure. Considering that the mortality among the seals would be much 

 increased during the breeding season, it occurred to me that the amphipods might have 

 migrated close inshore, more especially to Pram Point, as an area where a super- 

 abundant supply of food might be obtained. I went to investigate this matter, but the 

 seals had made their holes among the irregular blocks of ice piled up in a confused 

 manner. I found that the hole from the surface usually led on to a platform some 

 two or three feet below ; the hole which completed the passage through the ice had no 

 relation to the one above, and was generally at some distance from it, and quite 

 invisible from my point of view. As it turned out, I could not get a trap 'down any of 

 the holes, so that the presence of these amphipods on the breeding-grounds of the seals 

 is uncertain, and no explanation of their desertion of the traps in deeper water is 

 forthcoming." 



TRYPHOSA MURRAYI. 

 Tryphosa murrayi, A. 0. Walker. 

 T. adarei, A. 0. Walker. 



This is another abundant species, though not nearly so much so as 0. rossi. The 

 largest female measured 30 mm. It appears to occur from Cape Adare to lat. 77 50', 

 and was taken at the Winter Quarters throughout the year. 



The examination of a large number of specimens has convinced me that the 

 characters relied upon for the separation of T. murrayi and T. adarei, viz., the form of 

 the hind margin of the third pleon segment and the carina on the first urus segment 

 are very variable, and I have therefore united them. 



TRYPHOSA KERGUELENI. 

 Lysianassa kergueleni, Miers. 

 Hippomedon kergueleni (Miers), Stebbing. 

 Hoplonyx kergueleni (Miers), A. 0. Walker. 



Cape Wadsworth, 8-15 fm., 15 Jan., 1902, one, small ; W.Q., 15 June, 1902, one, 

 length 13 mm. ; W.Q., 20 Sept., 1902, Castle Rock, 14 fm., three. 



URISTES QIGAS. 

 Uristes gigas, Dana. 

 Tryphosa antennipotens, Stebbing. 



Past Cape Adare, 11 Jan., 1902, one specimen. 



PODOPRIONIDES. 

 Podoprionides, A. 0. Walker, Ann. and Mag. Nat. Hist. XVII. (1906), p. 457. 



Resembles Podoprionella, G. 0. Sars, in the chelate first gnathopods and the 

 deeply serrate first joints of the last three perseopods, but differs in the less compact 



