CRUSTACEA OF THE MERGUI ARCHIPELAGO. 73 
the mobile finger. The outer surface of the hands presents 
two longitudinal ridges or cost, and the rounded under margin 
is a little transversely rugose. The hands are unequal in 
size, the right being the larger. In both the immobile finger is 
a little shorter than the under margin of the palm. The 
fingers are costate and sulcate on their surface, and the tips 
are a little curved; the mobile finger of the larger chelipede 
is armed with a very strong tooth, directed obliquely backward 
at the base, and with some smaller teeth; and the index finger 
presents three broad, strongly depressed teeth at the base 
opposite to the strong basal tooth of the mobile finger, and 
seven much smaller unequal teeth, which gradually diminish in 
size towards the tip. On the index of the smaller hand these 
three depressed basal teeth are not found. 
The ambulatory legs are closely similar to those of Nept. 
rugosus, except the last pair, which agree most with those of 
Nept. hastatoides (de Haan, Fauna Japon. pl. i. fig. 8). The 
meropodites are almost as long as broad, but the penultimate 
joint or propodite is much longer than broad, being similar 
to the propodite of Nept. hastatoides, according to the figure in 
the ‘Fauna Japonica. In Nept. rugosus, on the contrary, the 
meropodite is longer than broad, and the propodite is com- 
paratively less elongate. Also the terminal joint is a little 
more elongate than in NV. rwgosus, agreeing in this respect more 
with Nept. hastatoides. 
Dimensions of the specimen described :— 
millim. 
Distance between the internal angles of the front 53 
Distance between the external orbital angles.... 183 
Distance between the tips of the terminal spines 
of the antero-lateral margins .............. 31 
Distance between the acute lateral angles of the 
POSLCMOLPMAT OIG fect wre visi Vs levee Soe 95 
Length of the carapace (the front included) .... 14 
Length of the under margin of the larger hand.. 14 
Genus THanamira, Latr. 
49, Toatamira Savianyl, A. Milne-Edw. 
Thalamita admete, Audouin, Egypte, Crustacés par Savigny, pl. iv. fig. 4. 
Thalamita Savignyi, Alph. Milne-Edwards, Archives du Muséum Hist. 
Nat. 1861, t. x. p. 357; de Man, Notes from the Leyden Museum, vol. ii. 
p- 180. © 
