CRUSTACEA OF THE MERGUI ARCHIPELAGO. 213 
Porcellana Lamarckii, Milne-Edwards, Hist. Nat. Crustacés, t. ii. p. 251, 
var. (nec Porcellana Lamarckii, Leach). 
Six fine specimens of this species were collected at Owen 
Island. 
I have compared them with a typical specimen of this species, 
kindly sent me by Dr. C. Koelbel, of the Imperial Museum 
of Vienna, where the typical specimens of the ‘ Novara’ Expedi- 
tion are preserved. 
The cephalothorax is flattened, and is quite as long as it is broad ; 
its upper surface is punctate in the middle and posteriorly, and is 
marked with faint trausverse striz anteriorly and towards its 
lateral margins. The front is triangular, with the apex rounded 
and subconcave above; it presents a mesial furrow, and a shorter 
- oblique one on each side, terminating at the internal angle of the 
orbits. The front is separated from the gastric region by a 
slightly elevated transverse crest, interrupted in the middle by 
the mesial frontal furrow. There is a faint cervical suture 
separating the gastric region from the rest of the upper surface. 
There is no epibranchial spine. The lateral margins are slightly 
cristate anteriorly, the carine extending to nearly the middle 
of the branchial regions. The antepenultimate joint of the 
peduncle of the external antenne is provided with a small trans- 
verse crest. 
The anterior legs are subequal. The arm has a blunt tooth at 
the distal end of the anterior margin and the external * margin 
of the under surface is armed with a small spinule about its 
middle. The wrist is nearly as long as the carapace and thrice 
as long as broad; its anterior margin is armed with three acute 
teeth, the first at the proximal end, the second a little before 
the middle, and the third as far distant from the second as the 
second is from the first. The obliquely rugose posterior margin 
of the wrist is prolonged at its distal end into a rather acute 
spine. The hands are much depressed and the inner borders of 
both fingers are densely hairy. The anterior half of the upper 
surface of the wrist is covered with flattened granules, which 
gradually pass into small, curved, transverse, squamiform lines at 
the posterior half; these granules and lines are bordered with 
minute hairs. The upper surface of the hands is covered with 
similar, flattened, piliferous granules and squamiform lines. 
* The external margin is that which articulates with the wrist. 
