CEUSTACBA OF THE MERGUI ARCHIPELAGO. 217 



posterior border is more or less spinulose along its whole length, 

 but in most specimens only three or four of the distal spines 

 are more distinctly developed. The outer surface of the hands 

 is rather depressed and covered with minute granules, often 

 arranged in very short transverse or oblique lines, especially 

 near the upj)er margin, similar to those of the upper surface of 

 the carpopodite. When examined under a strong magnifying- 

 glass, these minute granules appear to be provided anteriorly 

 with microscopical hairs. The fingers are shorter than the palm, 

 and are not hairy along their inner surfaces. 



The ambulatory legs are a little hairy. The anterior margin 

 of the meropodites is unarmed, but one or two small teeth are 

 observed at the distal ends of the posterior margins of the mero- 

 podites of the second and third pair of legs, those of the fourth 

 pair having the posterior margins unarmed. 



Dimensions of our largest specimen : — 



millim. 



Length of cephalothorax 11^ 



Breadth of same 11 



Length of carpopodite 9 



Length of hand 18 



The largest specimen observed by Heller had the carapace 

 14 millim. long. 



Porcellana dentata, M.-Edw., has been observed at the Nicobar 

 Islands {Heller), on the coast of Java {Milne-Edwards), and on 

 the shores of North and North-eastern Australia, appearing thus 

 to inhabit the Malaysian Archipelago and the neighbouring 

 seas. 



123. Porcellana Bosch, Aud. 



Porcellana Boscii, Audouin, Savigny, Description de V t gypte. Crust. 

 pi. vii. fig. 2. 



Porcellana Boscii, Heller, Sitzungsber. der Wiener Akad. der Wissensch. 

 Bd. xliv. p. 256. 



Petrolistlies Boscii, Kossmann, Zoolog. Ergebnisse einer Reise nach 

 dem Rothen Meeres, ii. Halfte, P Lief. p. 74. 



Porcellana Boscii, de Man, in Notes from the Leyden Museum, vol. iii. 

 p. 104. 



Porcellana rugosa, Milne-Edwards, Hist, Nat. des Crust aces, t. ii. 

 p. 252. 



rifteen specimens were captured at Elphinstone Island Bay, 

 and one in King Island Bay. 



