2 A. O. WALKER. 
temperate seas; Husirus propinqguus (G. O. Sars) and Melphidippa maecrura (G. O. 
Sars) have only been recorded before from the more northern waters of Norway ; 
Leucothoé 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 Colomastia 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. O. 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 Stenothoide 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 
Iphimedia hodgsoni has these so densely clothed with fine spines directed backwards 
as to have a shaggy appearance. All the four species of /phimedia 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 pereeopods in the adult males of Seba antarctica, may be mentioned. 
CLASSIFIED LIST OF ‘DISCOVERY’ AMPHIPODA. 
HYPERIIDEA.} 
FAM. VIBILIIDA, Crauvs. 
Genus Viera, H. Milne Edwards. 
V. propinqua, Stebbing. 
FAM. CYLLOPIDA, Bovauuius. 
GENUS CyLLopus, Dana. 
C. magellanicus, Dana. 
FAM. HYPERIIDA, Dana. 
GeENus Hyperta, Latreille. 
H. yaudichaudi, Milne Edwards. 
H. macronyx, A. O. Walker (1906). 
* © Southern Cross’ Paper, Journ. Linn. Soc., XXIX., p. 45 (1903). 
+ 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). 
