CRUSTACEA. 

 168 



2. Pedes 8 postici non crista ti. 



Xantho dispar. 



Carapax fere planus, eUipticus, latere rotundatus, non nitidus, antict non 

 bene areolatus, prope marginem impressus, marglne antwo areolarum 

 1 M ZMpauloirnpresso, lineis duabus regionem antero-lateralem inter- 

 secanMus; f route fere recto, non producto, marglne antero-laterali 

 crassiusculo, subacute, fere integro, levissimd trilobato, lobo antico 

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

 gulo posUorbitali non saliente. Pedes aniici valde incequi, manu supra 

 late rotundatd, corrugatd etpartim granulosa, digito moblll non cana- 

 licular, dente magna basali. Pedes 8 postid breves, submidi, articulis 

 Mo bio supra granulosis, 5fo 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 anterolateral region ; front 

 nearly straight, not produced ; anterolateral 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 

 arid 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 



