58 
T. V. HODGSON. 
Several specimens were taken from sponge debris and other dredge material at 
intervals during our stay at Winter Quarters inside the 25-fathom line, 1902 and 1903. 
HALIACRIS. 
This genus was established by Dr. Pfeffer in 1886 for specimens obtained in South 
Georgia. It is very much open to question if it is distinct from Munna. I think not. 
* 
HaLIACRIS ANTARCTICA. 
Haliacris antarctica Pfeffer (11). 
Haliacris australis Hodgson (8), pp. 253-4 ; Richardson (12), p. 16. 
This species was very abundant in Winter Quarters, and was continually being 
taken in the dredge and D-net throughout our stay. As might be expected, the friction 
they enjoyed in either of these implements was such as to more or less completely 
dismember them. In consequence only a very few specimens were obtained in a 
sufficiently satisfactory condition to justify preservation. In the summer, however, we 
could manage better; the D-net was always kept on the sea bottom, and also always 
hauled to the surface before use to be certain that it was properly “ set.” Although the 
temperature was below freezing point, the weather was generally bright and warm, and 
these animals were often found wandering; over the net or its frame. It was therefore a 
comparatively simple matter to pick them off and place them in a special pot, so that 
the majority arrived at the ship in a satisfactory condition. From the material thus 
obtained I have been able to examine this species in greater detail than hitherto. 
The description in the ‘ Southern Cross ’ Report is little more than worthless. There 
cannot be any doubt that the species there described is identical with that of 
Dr. Pfeffer taken in South Georgia. The £ Discovery ’ specimens also belong to the 
same species, and it is now seen that there is a sexual dimorphism, the old males 
modifying the shape of the urosome to a considerable extent. That this is due to age 
is certain, none of the smaller specimens have a urosome of such a shape, it is only 
found in the old males, some of which attain a length of seven millimetres. In these 
the posterior pereiopoda are of extreme tenuity. In life these animals are slow of 
habit; they crawl about with the metasome directed upwards, which seems to be its 
normal position. In colour they are a mottled-brown. 
Cephalosome broad, as long as the first, two segments of the mesosome, consider¬ 
ably reduced anteriorly to form a broad rostral plate ; on each side of this is a curved 
recess terminating externally in a curved spine in front of the eyes. The eyes are 
comparatively large, on lateral processes which are slightly constricted at the base. 
The posterior margin of the cephalosome is rounded, and the rostrum fringed with 
small setae. 
Mesosome. Four anterior segments differing very little in breadth, first and 
