BRACHY URA. 
By Mary J. Rarupun. U.S. National Museum, Washington. 
The crabs are referable to three species, two of which are well known. The 
third is a Megalops of large size which cannot be assigned to any described form, but 
appears to belong to Dana’s genus Marestia. The identity of the adult form of the 
species of this genus is still to be determined. 
HALICARCINUS PLANATUS (Fabricius, 1775). 
For synonymy, see Stebbing, Trans. Roy. Soc. Edinburgh, vol. 50, 1914, p. 271. 
Macquarie Island :— 
(1) Under stones and on spongy covering to rocks below low water; 24 females. 
Variously coloured, in spirit, from slaty-blue to reddish-brown, legs 
banded. Some with Spirorbis encrusting. 
(2) C. 38; Hamilton; 4 females, 2 juv. 
(3) C. 51; 3 juv. 
(4) Common under stones, North end; 6 females, soft shell (3 ovig.). Some 
with Spirorbis encrusting. 
(5) Under stones, littoral zone; 1 female ovig. 
(6) 1 female, 3 juv. 
(7) 1 female, 7 juv. 
All the specimens have the posterior of the lateral teeth of the carapace well 
developed and acute, while the anterior tooth is variable, often obsolescent—that is, 
obtuse-angled and blunt; in other cases acute or even sharp-pointed, and in a few 
specimens sharp on one side of the carapace and reduced on the other. The lateral 
teeth of the front are well separated from the median tooth, and are produced downward 
at the sides so that their inner surface is concave. 
NECTOCARCINUS ANTARCTICUS (Jacquinot.) 
Portunus antarcticus Jacquinot, in Jacquinot and Lucas, Voy. au Péle Sud, 
Zool., vol. 3, 1853, Crust., p. 51; atlas, plate V, figs. 1-5. 
1 male, 2 females, without indication of locality. Known only from New Zealand 
and the Auckland Islands. 
20218—B Vou. V, Part 2. 
