a 
CRUSTACEA OF THE MERGUI ARCHIPELAGO. 89 
the genus Eucrate the internal orbital hiatus is occupied by 
a process at the base of the antenna, so that the flagellum is 
quite excluded from the orbital cavity. In the genus Carcinoplaa, 
on the contrary, at least in the two species which I have 
studied, viz. OC. setosus and OC. integer, the internal orbital hiatus 
is occupied by the base of the antenne itself, as in Pelwmnus, so 
that the flagellum is not excluded from the orbits. According 
to the descriptions of Milne-Edwards and Stimpson, the genera 
Pseudorhombila and Pilumnoplax seem to agree with Carcinoplax 
in the flagella of their external antenne not being excluded from 
the orbits; whereas the genus Heteroplax, Stimps., agrees with 
Hucrate in the character of its external antenne. 
59. Evorate arrinis, Haswell. (Pl. V. figs. 5-7.) 
Eucrate affinis, Haswell, Catalogue of the Australian Stalk- and Sessile- 
eyed Crustacea, 1882, p. 86. 
? Pilumnoplax sulcatifrons, Stimpson, Proc. Acad. Nat. Scienc. Phila- 
delphia, 1858, p. 93. 
Four fine specimens (three g,one 2) of acrustacean collected 
at King Island Bay, I refer, although with some hesitation, to 
the-rare species H. affinis, Haswell. These specimens not only 
belong to the genus Hwecrate, de Haan, but in many characters 
even present a striking resemblance to the typical representative 
of this genus, H. crenata from Japan. Besides their smaller size, 
they may be distinguished from the latter species by the more 
depressed cephalothorax, and by the ridge-like elevations with 
which the upper surface is covered. 
I refer these specimens to Haswell’s H. affinis from the 
Australian coast, although his description of it does not com- 
pletely agree with them. Thus Haswell does not describe the 
anterior margin of the front as being transversely sulcated; and 
according to the same author, the wrist is very hairy externally, 
whereas in the Mergui specimens it is only hairy anteriorly towards 
and near the articulation with the hand. In Haswell’s specimens, 
also, the hands presented a longitudinal ridge close to the inferior 
border; but in the Mergui specimens an impressed longitudinal 
line is found only on the outer surface of the immobile finger 
close to the inferior border, the palm being quite smooth. 
The following is a full description of the four specimens. 
The cephalothorax closely resembles that of EH. crenata, the 
proportion of the breadth and the length being precisely the 
