CRUSTACEA OP THE MEE&UI AECHIPELAGO. 73 



the mobile finger. The outer surface of the hands presents 

 two longitudinal ridges or cosise, 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 linger 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 

 Nejpt. hastatoides (de Haan, Fauna Japon. pi. i. fig. 3). 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. liastatoides, 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 N. rugosus, agreeing in this respect more 

 with Nept. hastatoides. 



Dimensions of the specimen described : — 



millim. 



Distance between the internal angles of the front 5| 



Distance between the external orbital angles .... 18| 

 Distance between the tips of the terminal spines 



of the antero-lateral margins 31 



Distance between the acute lateral angles of the 



posterior margin 9^- 



Length of the carapace (the front included) .... 14 



Length of the under margin of the larger hand . . 14 



Genus Thalamita, Latr. 



49. Thalamita Savignti, A. MUne-Edw. 



Thalamita adtnete, Audouin, EgypU, Crustaces par Savigny, pi. iv, fig. 4. 



Thalamita Saviguyi, Alph. Milne-Edwards, Archives du Museum Hist. 

 Nat. 1861, t. X. p. 357; de Man, Notes from the Leyden Museum, vol. ii. 

 p. 180. 



