2^4 CRUSTACEA. 



Plate 16, fig. 3 a, animal, enlarged (from Carlshoff Island) ; h, under 

 view of front and mouth \ c, female abdomen ; d, male abdomen of 

 a specimen of similar colour, from Tongatabu; e, large hand, ibid.; / ? 

 tarsus, ibid. ; /', under view of extremity of same ; g, another variety, 

 Tahiti ; i, h } abdomen of same variety. 



From coral reefs of Carlshoff Island, Paumotus ; also from the reefs 

 of Tahiti, and from Tongatabu. 



Colour, chestnut brown, excepting sometimes a border along the 

 front and behind the eyes, which is often pale green, white, or grayish 

 white. Legs brown, also pale yellow, approaching pale flesh-red, with 

 the front margin sometimes brown. Length of carapax of specimen 

 from Tongatabu, five and a half lines; breadth, six and a half lines; 

 of specimen from Carlshoff* Island, length, four lines; of Tahiti speci- 

 men, length, two and one-fourth lines, and breadth, three lines. 



In most specimens, the right hand was very much the largest, as in 

 the figure; but in others, apparently of the same species, the left 

 was much the larger. The front, in the pale species from Tongatabu 

 and Carlshoff, is not at all sinuous; and it is but slightly so in the 

 Tahiti specimen, fig. g. The third joint of the posterior legs is less 

 stout proportionally than in the nigrifrons (length to breadth, as 1 to 

 2), and the carpus is not acute within. The female abdomen is very 

 large orbiculato-elliptical, and covers the whole sternum and even 

 the insertions of the legs. The inner apex of the arm is rather evenly 

 denticulate. 



Cancer glaberrimm, Herbst, op. cit., 262, pi. 20, f. 115. 



Trapezia serratifrons, Hombron and Jacquenot, Voy. au Pole Sud, pi. 4, f. 20-23. 



Trapezia glaherrima, Krauss, Siidaf. Crust., 35. 



Trapezia leucodactyla, Ruppell, loc. cit., 28. 



2. Carapacis latus spina armatum. 



Tetralia armata. 



Frons subtilissime dentiadatus, non sinuosus. Pedes anMci intvqui, mami 

 extus prope basin pvhescente, carpo splnu duahus intus unnato, arti- 

 cido tertioprope apicem internum 4 dentkiitU taniilnis ornato. Pedes 

 postici mediocres, m-ticido tertio paido angusto. 



