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 antarctic a Pfeffer (11). 



Haliacris australis Hodgson (8), pp. 253-4 ; Richardson (12), p. 10. 



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 



