CRUSTACEA. 

 2. Pedes 8 postici non cristati. 



XANTHO DISPAR. 



Garapax fere planus, ellipticus, lafere rotundatus, non nitidus, antice non 

 bene areolatus, prope marginem impressus, margins antico areolarum 

 1 M, 2 Mpaulo impresso, lineis duabus regionem antero-lateralem inter- 

 secantibus; fronte fere recto, non producto, margins antero-laterali 

 crassiusculo, subacuto, fere integro, levissime' trilobate, lobo antico 

 (D, E, N respondents) plus duplo longiore quam secundus (T), an- 

 gulo post-orbitali non saliente. Pedes antici valde incequi, manu supra 

 late rotundatd, corrugatd et partim granulosd, digito mobili non cana- 

 liculato, dente magno basali. Pedes 8 postici breves, subnudi, articulis 

 5to supra granulosis, 5to tarsoque minute villosis. 



Carapax nearly flat, elliptic in outline, surface not shining, sides 

 rounded, anteriorly not distinctly areolate, but with impressions 

 near the margin, anterior margin of areolets 1 M, 2 M a little im- 

 pressed, two elevated lines cross the antero-lateral region; front 

 nearly straight, not produced; antero-lateral margin rather stout, 

 subacute, nearly entire, very faintly trilobate, anterior lobe (corre- 

 sponding to D, E, N), more than twice as long as the second, post- 

 orbital angle not salient. Anterior feet very unequal, hand broad 

 rounded above, corrugate and somewhat granulous. moveable finger 

 not channeled, having a large basal tooth. Eight posterior feet 

 short, nearly naked, fourth and fifth joints granulous above, fifth 

 and tarsus minutely villous. 



Plate 8, fig. 6 a, female, enlarged two diameters ; b, front view of 

 part of front; c, side view of large hand; d, abdomen of female. 



Rio Janeiro? 



Length of carapax of female, five and a half lines; breadth, eight 

 and one-fourth lines; ratio of length to breadth, 1 : 1'5. This species 

 is near the planus; but the front is not projecting and is far more 

 inclined; the outline is more elliptical; the fourth joint of the eight 



