156 
“TERRA NOVA” EXPEDITION. 
mo.1.1. ioj-io*) 
differs from these in certain details of sculpturing on the carapace, but the evidence 
afforded by a solitary immature specimen is insufficient to justify either the establish¬ 
ment of a new species or an extension of the known range of C. undata from Norway 
to New Zealand. 
PHYLLOCARIDA. 
23. Nebedta longicorms, Gr. M. Thomson. 
Nebalia longicornis, G. M. Thomson, 1879, p. 418, pi. xix, figs. 7-9; N. 1. with var. magellanica, 
etc., Thiele, 1904, p. 9, figs, on pi. iv ; N. 1. magellanica, Thiele, 1905, p. 66, pi. ii, figs. 
14-17 ; Thiele, 1907, p. 1, text-figs. 
Occurrence. —Station 130. Off Three Kings Islands, New Zealand. Plankton. 
Square 18-mesh net at surface. Aug. 26-27, 1911, 8 p.m. to 6.30 a.m. One specimen. 
Station L35. Spirits Bay, New Zealand. Plankton. Square 18-mesh net at 
3 metres depth. Aug. 31 to Sept. I. 191 1, 9 p.m. to 6.30 am. One specimen. 
Station 331. Off Cape Bird Peninsula, entrance to McMurdo Sound. 250 fathoms, 
dredge. Jan. 14, 1912. One specimen. 
Remarks. —In the proportions of the rostral plate (2T : 1), in the form of the 
ocular peduncle with its “sensory” tubercle, and in the armature of the fourth segment 
of the antennule (1 spine, 7 or 8 setae), the specimen from McMurdo Sound agrees 
almost exactly with Thiele’s account of the “ Discovery ” specimens, and gives evidence, 
as far as a solitary specimen may, for constancy in the characters of the local race 
which Thiele refers to his subspecies magellanica. 
The two specimens from the north of New Zealand are noteworthy, in the first 
place, for the fact that they were taken with the surface-net. We have no record of 
the depth of water over which they were swimming, but it is not likely to have been 
great, and indeed many of the plankton-gatherings from this region contain animals 
that are, at most, temporary migrants from the bottom-fauna. 
Both the New Zealand specimens appear to be immature, and one of them retains 
the mucronate termination of the rostral plate regarded by Thiele as a juvenile 
character. Both specimens have on the anterior margin of the fourth antennular 
segment one strong spine followed by three or four setae, and so far agree with Thiele’s 
definition of N. longicornis as against the northern N. bipes. They diverge remarkably 
from this definition, however, in the narrow form of the rostral plate. In the specimen 
which is presumably the more mature of the two, the proportion of length to breadth 
is 2'76 : 1, that is to say, the plate is considerably narrower than that which Thiele 
figures (1904, pi. iv, fig. 7) as typical for N. bipes, the proportion measured from his 
figure being about 2 • 3 : 1. In both specimens the eyestalk is short, the corneal area 
occupies about half of its length, and the “sensory” tubercle is insignificant. 
If we attach primary importance (as Thiele seems to do) to the form of the rostral 
plate as distinctive between N. bipes and N. longicornis, then these New Zealand 
