~l 
OF NEW ZEALAND. 
lower margin notched; eyes, when retracted, touching the external 
orbital angle. Basal joint of the external antennez very wide, termi- 
nating in two strong spines, of which one fills the internal orbital 
hiatus, and separates the flagellum from it, which is visible at the sides 
of the rostrum. (M. E.). 
New Zealand (Quoy and Gaimard) (Coll. Brit. Mus.). 
There are specimens in the British Museum Collection from New 
Zealand and Port Jackson which agree very well with M. Edwards’ 
short description, given above, of this species. They resemble young 
specimens of P. peronii, but the depression separating the branchial 
and hepatic regions is more marked, the outermost of the two spines at 
the distal extremity of the basal joint of the external antenne is very 
long and visible from above, the external orbital spine is truncate, the 
penultimate lateral branchial spine is absent, and the last spine very 
long. Length, 14 in.; width, ¢ in. 
Sub-Genus LEPTOMITHRAX. 
Leptomithrax, Miers, Ann, Mag. Nat. Hist. (ser. 4) xvii, p. 220, 
(1876). 
Anterior legs in the male elongated, slender, hand and wrist sub- 
cylindrical, fingers meeting along their inner edges when closed, wrist 
simply granulated, without longitudinal ridges. 
This sub-genus is intermediate between the true Paramithrax and 
Maia of the northern hemisphere, from the latter genus it is dis- 
tinguished by the much narrower inter-orbital space, and basal joint 
of the external antenne, the flagellum of which arises from the orbital 
margin, and not from within the orbital cavity, as in Maia, It in- 
cludes the Paramithrax edwardsii of De Haan, and P. australiensis, 
Miers, in addition to the following species. 
6. Leptomithrax australis. 
Maia australis, Jacquinot and Lucas, Voy. Pole Sud. Zool. ini, 
Crust. p. 11, pl. u, fig. 1, (1853). 
Carapace rather broad, narrowed anteriorly, covered with smooth 
tubercles, and hairy. Spines of the rostrum short, scarcely divergent. 
Anterior angle of the upper orbital margin rounded, Antero-lateral 
margins with five spines. Ocular peduncles thick; eyes short. External 
