F 
ei, 4 
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CRUSTACEA OF THE MERGUI ARCHIPELAGO. 215 
121. Porcertana sapontca, de Haan. 
Porcellana japonica, de Haan, Fauna Japonica, Crustacea, p. 199, 
pl. 1. fig. 5. 
Petrolisthes japonicus, Stimpson, Proc. Acad. Nat. Sci. Phil. 1858, p.241. 
Two individuals were collected, the smaller of the two having 
been obtained in Elphinstone Island Bay. 
Tn this species the middle and posterior portion of the upper sur- 
face of the carapace are minutely punctated, whereas its anterior 
part and its sides are delicately lineolate. An epibranchial tooth 
is wanting, and the lateral margins of the cephalothorax are rather 
acute. The anterior margins of the meropodites of the somewhat 
unequal chelipedes are unilobate at their external angles; the 
exterior margins of these joints, by which they articulate with the 
carpopodites, are armed in the small specimen with a small acute 
tooth in the middle (which was not described by de Haan), but 
in the larger individual these margins are unarmed. ‘The car- 
popodite is quite as long as the carapace ; its anterior margin is 
armed, in both specimens, with only one small acute tooth, 
situated at the proximal end, and the posterior margin is bispi- 
nose, being armed with an acute tooth at the distal end, and 
with a second placed a little before it. The outer surface 
of the palm is rather convex, and the fingers are shorter than 
the palm, especially in the larger hand. They are hairy on their 
inner margins as in the preceding species. 
Porcellana japonica is represented in the seas of New Zealand 
by Porcellana elongata, M.-Edw., a species which may be dis- 
tinguished from that of de Haan by the upper surface of its 
carapace being distinctly granulated. Porcellana inermis, Has- 
well (nee Heller), from Port Denison, will probably prove to be 
identical with P. elongata. 
Dimensions of the larger specimen :— 
millim. 
Wem on cophalothorax.:.-...0..+ss0+aes%e- 81 
TEvrandteley One QPRTave ys eee Ae eee ea mo er 72 
Length of carpopodite of anterior legs.......... 3 
Memetmonrlarrer Wand. so. es es oss lowe sone: 153 
Porcellana japonica has hitherto been recorded only from the 
Japanese and Chinese Seas (de Haan, Stimpson). 
