CRUSTACEA OF THE MERGUI ARCHIPELAGO. 6g 
I am comparing, which is scarcely more than 11 millim 
broad. 
P. hirsutus, Stimps., from the Corean seas, differs from P. An- 
dersoni by the larger hand being only granulated on its upper 
margin, and not at all on its outer surface. (See Miers, Proc. 
Zool. Soc. 1879, p. 31.) 
Hilgendorf’s P. longicornis, from the coast of Mozambique, 
may be easily distinguished from P. Andersonit by its antero- 
lateral teeth, which are not spiniform. Pilwmnus Bleekeri, Miers, 
from New Guinea, presents a spiniform extraorbital angle and a 
distinct subhepatic spine. 
Pilumnus terre-regine, Hasw., from Queensland, presents a 
patch of small granulations on the mesobranchial regions (which 
in P. Andersoni are smooth), the granules on the larger hand are 
rounded, and it has a row of obscure granules on the lower border 
of the merus and hand of the smaller chelipede. 
The upper surface of the cephalothorax of P. vestitus, Hasw., 
also from the eastern coast of Australia, is described as pre- 
senting no distinct granules, whereas in this species the upper 
surface is distinctly granulate anteriorly, as already mentioned. 
P. vestitus, however, appears closely allied to P. Andersoni, and 
a more exact knowledge of it is desirable. 
42. PILUMNUS SEMINUDUS, Miers. 
Pilumnus seminudus, Miers, Crustacea of the Voyage of H.M.S. 
‘ Alert,’ 1884, p. 222, pl. xxi. fig. c. 
A young female crab found at Owen Island I believe to belong 
to the above-named species. 
The cephalothorax is rather enlarged, the proportion of the 
breadth to the length being about as 7 to 5. The upper sur- 
face, which is a little convex longitudinally and somewhat decli- 
vous towards the lateral margins, presents no trace of divisional 
inter-regional grooves, and is everywhere clothed with a close 
velvety pubescence. I only observe a very faintly indicated 
mesial longitudinal furrow. The front is nearly straight and 
presents a small median incision; the two lobes into which the 
front is thus divided are not separated by a notch from the 
internal orbital angles, so that the latter constitute at the same 
time the external angles of the front. The orbital margins are 
minutely denticulate, though the denticulation of the upper 
margin is scarcely visible; the internal angle of the lower border 
LINN. JOURN.—ZOOLOGY, VOL. XXII. 5 
