AMPHIPODA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 469 
Genus TrRyPHOSITES G. O. Sars, 1891. 
Tryphosites stebbingi « Walker). 
Hoplonyx stebbingi Walker, 1903a, p. 52, pl. ix. figs. 52 to 57. 
Tmetonyx stebbingt Stebbing, 1906, p. 720. 
3 . Chilton, 1909a, p. 618. 
Station 411, Coats Land, lat. 74° 1’ S., long. 22° W.; 161 fathoms. Many 
specimens, about 17 mm. long. 
I have compared these specimens with those from the Southern Cross Expedition 
on which Mr Waker established the species, and find that they agree closely in all 
points, except that the lateral process of the head might almost be called acute instead 
of “ point rounded ’—in some of the Southern Cross specimens it is almost or quite as 
acute as in the Scotia specimens. The first segment of the urus is slightly compressed, 
but hardly sufficiently so to be called varinate. The eyes are very indistinct or absent 
completely. The first gnathopod has the propod slightly narrowed towards the distal 
end, with the palm short and not well defined ; in one specimen the palm was found to 
be rather oblique on one side of the body, while on the other it was almost transverse ; 
the dactyl has a prominent secondary nail. In this specimen the second uropod had 
the inner branch somewhat constricted towards the distal end, as shown by STEBBING 
for Tryphosa cicadoides (1888, pl. iv. fig. wr.) ; the telson is long and narrow, without 
marginal spinules, but with two small spinules in the emargination at the end of 
each lobe. 
The species appears to be close to 7. cicadoides Stebbing, one of the chief differences 
being apparently in the shape of the telson ; but it is to be noted that the drawings of 
the telson of the two specimens represented on plates iv. and v. of the Challenger Report 
differ to some extent. 
The species was described by WaLkER under the genus Hoplonyx, and compared 
with H. kerguelen (Miers), which is now placed under Tryphosa, the genus to which 
T. cicadoides was first assigned. Tryphosa kergueleni is certainly not unlike Tmetonyx 
stebbinyi, but differs in the points mentioned by Watker, and particularly in having 
the propod of the first gnathopod stouter and with the palm regularly rather oblique. 
The first gnathopod of Tryphosa trigonica, as figured in the Challenger Report, is more 
like that of 7. stebbingi, and in describing that species Mr Sressine suggested that it 
was perhaps the young of 7. kergueleni (Miers). 
In the Scotza specimens, and also in those collected by the Southern Cross, the 
epistome is produced anteriorly into an acute process as in 7ryphosites longipes (Bate 
and Westwood), and the species must be placed in the same genus, though the 
differences between Tryphosa, Tmetonyx, and Tryphosites are very trifling. Tryphosites 
stebbingi appears to be very close to 7’. longipes of northern seas, differing chiefly in 
having the perzeopoda shorter and stouter and the eyes indistinct. 
