502 PROFESSOR CHARLES CHILTON ON THE 
South Orkneys, Scotia Bay, Station 325; 2-8 fathoms, gravel and clumps of 
weed. Temperature 29°-30°. 6th December 1903. Several specimens, 
the largest 14 mm. in length. 
These specimens are in most respects intermediate between P. pacifica and P. 
Jissicauda. They agree with the latter species, except that the last segments of the 
pereeon are without dorsal teeth, or, in the largest, with a small tooth on the last 
segment only. In this species, as in so many others, the dorsal teeth evidently vary, 
for STEBBING notes the same thing in his description of P. pacifica. The Scotva specimens 
have the lateral angle of the head rounded, as in P. fissicauda, and they resemble that 
species also in the greater stoutness and the proportions of the joints of the antennee 
and pereapoda; the telson, however, is not split right to the base, but only very 
deeply, as in P. pacifica. 
Through the kindness of Mr Srrppine I have been able to examine specimens of 
P. pacifica from New Zealand sent to him years ago by Mr THomson. The comparison 
of these with the Scotia specimens shows that it is not possible to maintain the two as 
separate species. In the carination of the body, in the uropoda and telson, the New 
Zealand specimens resemble those from the South Orkneys. ‘They differ, however, in 
having the appendages slightly more slender ; thus the upper antennze may have the 
second joint of the peduncle considerably longer than the first, and in the perseopoda 
the propod may be nearly as long as the carpus, instead of being shorter, as described 
by CHevreux. In them, too, the lateral angle of the head is produced into a small, 
sharp, acute point. 
If we had to deal only with the New Zealand specimens and those from Wandel 
Island, it might be possible to look upon the latter as a separate but closely allied 
species ; but, if that were done, a new species would have to be made for the South 
Orkneys specimens, with characters almost precisely intermediate between those of the 
other two, while future examination of specimens from some fresh locality would probably 
necessitate the establishment of another intermediate species on very trivial points of 
difference. I therefore think it much the best course to consider all the specimens as 
belonging to one widely spread sub-Antarctic and Antarctic species which, through isola- 
tion, has become slightly modified into two or three local varieties. 
Genus PoLycHERIA Haswell, 1879. 
Polycherva antarctica (Stebbing). 
Dexamine antarctica Stebbing, 1875, p. 184, pl. xv.a, fig. 1. 
Polycheria tenuipes Haswell, 1880x, p. 345, pl. xxii. fig. 8. 
a »  Stebbing, 1906, p. 520. 
- brevicornis Haswell, 1880s, p. 346. 
a obtusa G. M. Thomson, 1882, p. 233, pl. xvii. fig. 3. 
Triteta kergueleni Stebbing, 1888, p. 941, pl. lxxxiii, 
»  antarctica Walker, 1904, p. 266, pl. iv. fig. 25. 
