A. 0. WALKER. 



temperate seas ; Eusirus propinquus (G. 0. Sars) and Melphidippa macrura (G. 0. 

 Sars) have only been recorded before from the more northern waters of Norway ; 

 Leucothoe spinicarpa (Abildgaard) appears to be ubiquitous, and I am unable to see any 

 difference between those taken from the ice-holes of the Winter Quarters and those 

 from our own seas and the tropical seas of Ceylon and the Maldives. This is an 

 ascidiicolous species, and probably owes its wide distribution to the drifting of its host 

 by currents and winds. The same may be said of the two spongicolous species, 

 Polycheria antarctica (Stebbing) and Colomastix pusilla (Grube), of which the former 

 has also been taken in Ceylon, but not further north ; while the latter has been found in 

 the British Isles, the Mediterranean, and Ceylon, but is not recorded from Norway or 

 Arctic seas. These species must have a great capacity of adaptation to extremes of 

 heat and cold. On the other hand, Orchomenopsis rossi appears to be able to exist 

 only in water just above the freezing point.* 



As species remarkable for peculiarity of structure may be mentioned the following : 

 Hyperiopsis australis, of anomalous structure, and belonging to a genus so rare that 

 previous to the capture of the single specimen in this collection only two individuals 

 of another, but nearly allied species, H. Voeringii G. 0. Sars, had been taken off the 

 coast of Norway ; Thaumatelson herdmani is the only known Amphipod which has its 

 telson set on in a vertical plane ; in the rest of the Stenothoidse it is horizontal and 

 generally spoon-shaped, with the concave side uppermost. Epimeria macrodonta 

 is characterised by the long curved and sharp teeth on the body segments ; while 

 Ipliimedia hodgsoni has these so densely clothed with fine spines directed backwards 

 as to have a shaggy appearance. All the four species of Ipliimedia in the collection 

 are of very large size compared to the northern species, measuring from 20 to 45mm. in 

 length. Lastly, the remarkable development of the meral joints of the last three pairs 

 of perseopods in the adult males of Seba antarctica, may be mentioned. 



CLASSIFIED LIST OF 'DISCOVERY' AMPHIPODA. 



HYPERIIDEA.f 



FAM. VIBILIID^:, GLAUS. 

 GENUS VIBILIA, H. Milne Edwards. 

 V. projiinqua, Stebbing. 



FAM. CYLLOPID^B, BOVALLIUS. 



GENUS CYLLOPUS, Dana. 

 G. magellanicus, Dana. 



FAM. HYPERIID^E, DANA. 

 GENUS HYPEEIA, Latreille. 

 H. ijaitidichaudi, Milne Edwards. 

 H. macronyx, A. 0. Walker (1906). 



* ' Southern Cross ' Paper, Journ. Linn. Soe., XXIX., p. 45 (1903). 



t For references to and descriptions of the Hyperiidea, see " Bovallius, Monograph of the Amphipoda 

 Hyperiidea " (Kongl. Svenska Vetenskaps-Akademiens Handlingar, Band 21 and 22, 1887 and 1889). 



