CANCROIDEA. 259 



Serratures of arm, five or six, acute, curved at apex. Fingers in- 

 curved at apex. Eight posterior legs rather slender, length of third 

 joint more than three times its breadth, last three joints sparsely 

 hairy. 



Unlike the cymodoce, the lateral tooth of the carapax, the inner 

 angle of the carpus, and the inferior orbital tooth, are all acute ; and 

 the front margin is rather more sinuous. There are six low promi- 

 nences to this margin, of which the one next to the outer, either side, 

 is truncate. 



Var. subintegra. — Plate 15, fig. 7, represents a specimen from Disap- 

 pointment Island (Paumotus), which has the lateral tooth and inner 

 angle of carpus prominent acute, but the front of the carapax is only 

 very slightly sinuous. The length was three lines. Colour, light 

 orange, bordering on flesh-red. Eggs orange. 



Grapsillus dentatus, M'Leay, S. Af. Crust., pi. 3. 



Trapezia areolata. 



Frons sinuosus, angido orbitce inferiore interno subacuto. Pedes antici 

 mediocres, margine articidi tertli interno serrato, dente apicali curvato; 

 carpo angulum internum acuto. Pedes 8 postici sat breves, sparsim 

 pubescentes, tarso paulo breviore quam articidus precedens. Carapax 

 colore brunneo lati areolatus. 



Front sinuous, inner margin of orbit subacute. Anterior feet of 

 moderate size, inner margin of third joint serrate, apical tooth 

 curved; carpus acute within. Eight posterior feet rather short, 

 sparsely pubescent, tarsus a little shorter than preceding joint. 

 Carapax divided into large areas by brown lines. 



Plate 15, fig. 8 a, animal, enlarged; b, abdomen of female. 



From corals of outer reef of Tahiti. 



Length, three and a half lines ; breadth, four lines. Colour brown- 

 ish or grayish yellow, darker anteriorly, with a coarse network of dark- 

 brown lines, enclosing irregular angular areas. Legs brownish or red- 



