CANCROIDEA. 263 



Front minutely denticulate, very slightly sinuous, two obsolescent 

 lobes at middle. Anterior feet very unequal, the carpus acute 

 within. Eight posterior feet nearly naked, third joint of posterior 

 pair very broad, its length one and a half times the breadth, nearly 

 three times as broad as the fifth joint. 



Plate 16, fig. 2 a, animal, enlarged ; b, outline of front ; c, exterior 

 inaxillipeds ; d, abdomen. 



Coral reefs at Honden Island, Paumotu Archipelago. 



Length, two to three lines. Carapax mostly whitish, with the front 

 margin brownish black ; legs dark brown. 



The front may be said to be obsoletely four-lobed, the two inner 

 lobes short, the outer long; but all are very slightly prominent. The 

 teeth or pectinations on the margin are largest laterally. The apex 

 of the basal portion of the outer antennae was visible beyond the front 

 in an upper view. 



The abdomen was not closely applied to the venter when in its 

 natural state, but appeared a little lax, as shown in the figure. Its 

 form is oblong elliptical; but we are not certain that it was mature. 

 The great breadth of the third joint of the posterior pair of legs is a 

 striking character. 



TetrAlia glaberrima (Herbst), Dana. 



Frons subtilissimd denticulatus, non sinuosus. Pedes antici incequi, 

 manu extus prope basin pubescente, articido tertio apicem internum 

 rotundato et ad marginem internum denticidato, carpo apicem inter- 

 num rotundato. Pedes octo postici fere nudi, articido tertio par is pos- 

 tici paulido latiore quam articulus quintus, articulo quinto crassius- 

 culo. 



Front very minutely denticulate, not sinuous. Anterior feet unequal, 

 hand externally towards base somewhat pubescent, third joint on 

 inner margin toward apex denticulate, carpus rounded within. 

 Eight posterior feet nearly naked, third joint of posterior pair 

 slightly broader than fifth joint, fifth joint stout. 



