CANCROIDEA. >, _ 2 61 



Reefs of Tahiti (fig. 1 a), and Upolu, one of the Samoan Islands 

 (fig. 1 6) ; also from the Sooloo Islands. 



Length of carapax, four and a half lines; breadth, six lines. 

 Carapax and anterior legs tawny yellow, or with a tinge of car- 

 mine ; anterior and part of lateral margin of carapax, also margin of 

 anterior legs, and all of eight posterior legs, tinged with carmine. 

 Another variety (Samoa), carapax pearl-white, with a slight flesh 

 tinge, front margin brown ; eight posterior legs with brownish red 

 spots or stripes. In some young specimens, the inner apex of carpus 

 is acute and spiniform. 



The species is near the cymodoce, but the side spine is more pro- 

 minent acute. 



We suspect, that the T. septata, from the Sooloo Sea, is only a va- 

 riety of this species, although so different in colour. 



Trapezia cymodoce, AUDOUIN, Savigny, op. cit., pi. 5, f. 2. 



Trapezia fermginea, LATREILLE, Encyc., x. 695; EDWARDS, Crust., i. 429. 



GENUS TETRALIA, Dana. 



Carapace Trapeziae affinis, superficie glaberrimd, fronte Iwrizoniall 

 latissimo, oculis ad angulos anticos insitis, margine laterali fere longi- 

 tudinali et postlce introrsum arcuato. Prom subtilitissime' denticu- 

 latus. Pedes antici breviores, brac7iio apicein paulo exserto, pollice 

 valde deflexo ; postici extremitate breviter unguiculati. Maxillipes 

 externus marginem posticum valde obliquus, et non transversus, apici- 

 bus articulorum secundorum paulo remotis. Abdomen maris 7-articu- 

 latum. 



Near Trapezia in the carapax, the surface being smooth, the front 

 horizontal, very broad, eyes at the angles, lateral margin very 

 nearly longitudinal, arid behind arcuate inward. Front very 

 minutely and neatly denticulate. Anterior feet much shorter than 

 in Trapezia, extremity of arm little exsert, thumb very much 

 deflexed; posterior feet having a short claw at extremity. Outer 

 maxillipeds very oblique at the posterior margin, instead of trans- 

 verse, apices of the second joints somewhat remote. Abdomen of 



male consisting of seven segments. 



66 



