Doi lili 
CRUSTACEA OF THE MERGUI ARCHIPELAGO. 67 
with longer hairs, namely—one on the front between the orbits, 
parallel with the frontal margin, and one on each side of the 
carapace, starting from the last antero-lateral tooth, separating 
the antero-lateral portion of the cephalothorax from the postero- 
lateral, but not reaching as far as the gastric region. 
The front is a little broader than a third of the distance between 
the last antero-lateral teeth, the proportion of that distance to the 
breadth being as 23 to 9; it is somewhat declivous and divided by 
a small median triangular notch into two rather prominent and 
slightly oblique lobes, with a nearly straight or slightly emar- 
ginate anterior margin. The frontal lobes are not continuous 
with the orbital margin, but separated laterally from the internal 
orbital angles by a small angular cleft. The orbital margins, 
both the superior and the inferior, are entire and not denticulate ; 
the upper margin presenting moreover no incision, this species 
belongs to the subgenus Parapilumnus, Kossmann. 
The external orbital angle is not at all prominent and the 
antero-lateral margins of the cephalothorax, which are a little 
shorter than the postero-lateral, are armed with three small 
spiniform teeth behind the angle of the orbits, the last being a 
little smaller than the two anterior ones. 
The pterygostomian regions are perfectly smooth and there is 
no trace of a subhepatic spine. As regards the male abdomen, 
I will only remark that the penultimate joint is a little broader 
than long. 
The anterior legs or chelipedes are of unequal size, and in 
both the specimens the right is the larger. The larger chelipede 
is everywhere smooth and glabrous, and dves not present even a 
trace of granulation, but appears polished and shining. The 
arm is very short, scarcely extending beyond the lateral margins 
of the carapace; its anterior margin is armed with two or three 
small acute teeth. The wrist has a polished convex upper surface, 
and is armed at its internal angle with a short though acute 
tooth. The hand is very large, like the wrist, and nearly as 
long as the breadth of the cephalothorax ; its surface is every- 
where smooth, convex, polished, and glabrous. The fingers are 
also smooth, not sulcate, and their pointed tips cross one 
another. 
The smaller chelipede resembles the larger, but the wrist and 
the hand are a little hairy and the mobile finger is slightly sul- 
cate longitudinally. 
5* 
