ts 



3. Paratelphusa (Paratelphusa) blanfordi, Alcock. (Fig. 16.) 



This sjDecies is an aberrant member of the subgenus, as it has no spine on 

 the upper border of the merus of the chelipeds and no large spines on the 

 antero-lateral borders of the carapace between the external orbital tooth and 

 the lateral epibranchial spine. Added to this it has peculiar chelae, the tips of 

 the fingers being broad and hollowed en cuillere. 



Notwithstanding these peculiarities, it is undoubtedly nearer to P. spinigera 

 than to any other species. It has nothing whatever to do with Paratelphusa 

 spinescens, Caiman, which de Man has made the type of a new subgenus, Para- 

 potamon; that species has a simple mandibular palp, like Potamon, and must 

 be ranged alongside Acanthotelphusa. 



Carapace flat, its length a little over three-fourths its greatest breadth, its 

 depth a good deal less than half its length, its surface, to the naked eye, 

 smooth, with some short and very fine oblique wrinkles at the postero-lateral 

 borders. 



Cervical groove deep, very broad, running towards the much posterior 

 epibranchial spine, but becoming superficial and almost disappearing before 

 reaching it. 



Regions distinct ; in the gastro-cardiac angle of either epibranchial region 

 there is an irregular, sometimes indistinct, facet, and between these, two 

 small indistinct prtecardiac facets. Post-frontal mesogastric groove deep in 

 places. 



Front in adult a little more than one-third the greatest breadth of the 

 carapace, very slightly declivous, its sides either nearly parallel or oblique, its 

 edge nearly smooth (crenulate in the young) and straight. External orbital 

 angle broad, subacute, not separated from lower border of orbit by any gap. 



Antero-lateral borders of carapace convex, sharp, crenulate, more than 

 two-fifths of their extent is in front of the prominent and acute epibranchial 

 spine. Postero-lateral borders markedly convergent. 



Epigastric crests prominent, rugulose, overlapping and a little in advance 

 of the post-orbital crests. Post-orbital crests thin, sharp, crenulate, more or 

 less broken at their outer ends, but distinctly passing to the epibranchial spine, 

 or to the edge of the carapace just in front of it. 



Abdomen of adult male not much broadened at base ; 6th segment with 

 convergent and concave sides, its length equals its distal breadth ; 7th segment 

 as long as broad, broadly rounded at tip. 



The antennal peduncle loosely fills the orbital gap ; the flagellum is 

 short. 



Mandibular palp as described in the diagnosis of the subgenus. The 

 exopodites of all the maxillipeds have a strong flagellum. In the external 



