67 



faintly. The tip of the mesogastric area can just be made out behind the 

 groove separating the epigastric crests. 



Front hardly deflexed, about two-fifths the greatest breadth of the cara- 

 pace in the adult, its sides are convergent and slightly convex dorsally, its edge 

 is crenulate and faintly sinuous, and overshadows the epistome a good deal. 



Orbits wide, with crenulate margins ; a gap between the lower margin 

 and the outer orbital tooth. 



Antero-lateral borders of carapace almost as long as the postero-lateral, 

 cut into four broad sharp teeth (exclusive of the orbital tooth), the edges of 

 some of which are crenulate. 



Epigastric crests low, slightly oblique, separated from and slightly in 

 advance of the post-orbital crests; post-orbital crests low but sharpish, 

 straight and distinct as far as the point (inner limit of orbital tooth), where the 

 indistinct cervical groove meets them, and then either disappearing or becoming 

 extremely faint as they curve forwards towards the anterior marginal tooth. 



In the male abdomen the 6th segment is about twice as broad as long, 

 and the 7th is nearly as long as broad. 



All the mouth-parts are as in P. dayanum except that the outer surface 

 of the ischium of the external maxillipeds is not longitudinally grooved. 



. Chelipeds unequal in both sexes, very much so in old males. Their 

 surface is practically smooth. Merus with the usual subterminal spine on its 

 upper border; upper surface of carpus sometimes with a dimple; the spine 

 at the inner angle of the carpus has only a trace of a cusp at its base. In 

 the smaller cheliped the fingers are much longer than the palm and do 

 not gape; in the larger cheliped they are little longer than the palm, have 

 molariform teeth, and gape when closed— widely so in the adult male. 



Legs about as long as the smaller chehped ; in the three terminal joints 

 one or both edges are clothed with a thick spongy fur ; the longer propodites 

 are more than twice as long as broad. 



In a large male the carapace is IyV inch long, IH! inch broad, 

 and Hths inch deep. 



6889 -. ( I i (type). 



Pegu Yoma. W. Theobald. 



[ 6 c?,l 9. 



40. POTAMON (AcANTHOTELPHUSA) CEENULIFERUM, var. FLOCCOSUM. 



In this small variety the carapace is more convex than in the type, and 

 is closely beset with little isolated tufts of down. In all other respects it 

 agrees with the type. 



6905^ Peo-u, S. Kurz. 8 cj , 7 ? (all immature). 



