112 



88. Paratelphusa (Liotelphusa) austrina, Alcock. (Fig. 29.) 



Carapace convex, square-cut, its length nearly seven-eighths its breadth, 

 its depth more than half its length ; to the naked eye its surface is smooth ; 

 the regions are not defined, the cervical groove is hardly visible, and even the 

 post-frontal mesogastric furrow is indistinct. 



Front not much more than two-fifths the greatest breadth of the carapace, 

 strongly deflexed, very distinctly bilobed ; as in Paratelphusa hydrodromus 

 and boumeri and few other Indian species, the free edge of the front proper is 

 distinct from the edge that roofs the antennular fossae — i.e., the edge of the 

 front is distinctly double. Outer orbital angle subacute, not separated from 

 the lower border of the orbit by a gap. 



Antero- lateral borders of carapace short, little arched ; lateral epibranchial 

 tooth small, subacute. 



Epigastric and post-orbital crests only just distinguishable. 



Three terminal segments of male abdomen much contracted ; 6th segment 

 narrow, with parallel sides, its length more than its proximal breadth. 



Antennular fossse not contracted; antennal flagellum of good length. 

 Mandibular palp of the typical Paratelphusa form, the terminal segment being 

 bifurcate from its base. 



In the external maxiUipeds the exopodite is longer than the ischium, 

 and has a strong flagellum ; the ventral surface of the ischium is longitudinally 

 grooved, and the merus is quadrangular and slightly broader than long. 



Chelipeds unequal in the adult male, smooth to the naked eye ; carpal 

 spine acute ; palm of large cheliped inflated, nearly as high as long ; fingers 

 about as long as palm, pointed, none of the teeth much enlarged. 



Legs longer than smaller cheliped ; dactyh longer than propodites. 



In the unique adult male specimen the carapace is nearly iiyths inch long, 

 and ^ inch broad. 



i^. S. India. F. Beddome. 1 $ (type). 



I do not care about describing a new species of Potamonida' from a single 

 specimen, but this species is clearly distinct from anything else. 



In general appearance it is much like P. levis, var. quadrata, but the 

 bilobed front, with double edge Hke that of P. hydrodromus, at once 

 distinguishes it, as does the long narrow 6th abdominal segment of the male. 



39. Paratelphusa (Liotelphusa), sp. nov. prox. levis. 



This species is not to be named, as it cannot be properly described from 

 an imperfect specimen. 



The shape of the carapace is square, as in P. levis, var. quadrata ; the 



