484 PROFESSOR CHARLES CHILTON ON THE 
The third uropod reaches a little beyond the peduncle of the second ; its single branch 
is about as long as the peduncle, but rather more slender, and bears a minute second 
joint. The telson reaches slightly beyond the third uropod, is greatly flattened 
vertically, and has the dorsal border somewhat thickened, as described in 7. walker. 
In many respects this species shows close approximation to 7. herdmani, described 
by Mr Watxrr, from South Victoria Land, but is clearly distinguished by the large 
chelate second gnathopod. This may, however, ultimately prove to be a sexual 
character. 
Thaumatelson herdmani Walker. 
Thaumatelson herdmant Walker, 1906, p. 15, and 1907, p. 21, pl. vii. fig. 11. 
South Orkneys, Scotia Bay, Station 325. 1903. A few specimens. 
After | had drawn up the description of the preceding species, with the remarks 
thereon, [ found in the “‘ residues ” of some collections made during 1903 both additional 
specimens of that species and also others with subchelate second gnathopoda agreeing 
in all respects with 7. herdmam Walker, so that that species also does occur at Scotia 
Bay. I can find very little difference between the two except in the second onathopoda, 
and, as stated above, strongly suspect that both forms belong to the same species ; but 
the additional specimens came into my hands too late to allow of the question being 
fully investigated. 
Genus Brrcenna Chilton, 1884. 
Bircenna crassipes (Chevreux). © 
Wandelia crassipes Chevreux, 1906, p. 87, figs. 1 and 2. 
$3 5 5 1906x, p. 45, figs. 24-26. 
Bircenna crassipes Chilton, 1909, p. 62. 
South Orkneys, Scotia Bay, Station 325; dredge, 9-10 fathoms. May 1903. 
One specimen, 2 mm. long. 
This small specimen agrees very closely with Cuzvreux’s description and figures. 
The species is very close to B. fulva Chilton from New Zealand, and differs from it 
only in the longer and more slender gnathopods, and in having the branches of the 
first and second uropods equal and shorter in proportion to the peduncles. 
Kuria longimana Walker and Scott (1903, p. 228), from the Indian Ocean, appears 
to be nearest ally of the genus Bircenna. 
Genus CotomastTIx KE. Grube, 1861. 
Colomastix brazert Haswell. 
Colomastia braziert Haswell, 1880, p. 341, pl. xxii. fig. 4. 
Stebbing, 1906, p. 206. 
South Orkneys, Scotia Bay, Station 325. 1903. Two small females, the larger 
3°5 mm. long. 
These specimens certainly belong to this genus, and probably to Haswe 1's species ; 
