72 

 The species of Paratelphusa may be tabulated as follows : — 



I. A subterniinal spine or tubercle on the upper border of the merus of the 

 chelipeds ; fingers sharp pointed : — 



i. No Jarge spines or teeth or lobes between the orbital angle and the 



lateral epibranchial spine . . . . . .P. spiiiigeia. 



ii. A broad laminar lobe between the outer orbital angle and the lateral 



epibranchial spine . . . . . . .P. tnlohata. 



iii. Three large spines on the antero-lateral border of the carapace behind 

 the outer orbital tooth ; 6th segment of abdomen of adult male con- 

 tracted at base : — 



1. "Cervical" groove indistinct; bth segment of male abdomen 



short and broad (length = half proximal breadth) . . P. sinensix. 



2. " Cervical " groove distinct ; 5/// segment of male abdomen 

 elongate (length nearly = proximal and exceeds distal breadth) . P. grayi. 



II. No subterminal spine or tubercle on the upper border of the merus of the 

 chelipeds ; no large spines or teeth between the outer orbital angle and the 

 lateral epibranchial spine ; fingers blunt and spooned at tip . . P. hlanfoidi. 



1. Pakatelphusa (Paratelphusa) spinigera, Wood-Mason. (Fig. 53.) 



Telphusa {Paraleiphusa) spinigera, Wood-Mason, Journ. Asiatic Soc, Bengal, XL., pt. 2, 1871, p. 194, pi. 

 xii., figs. 1-4. 



Po/amon (Paratflphiisa) xpiniffer, Mary J. Rathbun, Nouv. Archiv. du Museum (4), VII., 1905, p. 231 {uhi 

 lit.), pi. xvii., fig. 1. 



Carapace broad, convex, its length about two-thirds its greatest breadth, 

 its depth about half its length ; its surface, except for some very fine ripples at 

 the postero-lateral borders, is smooth and sometimes almost polished. 



"Cervical" groove deep, rmining towards the outer ends of the post- 

 orbital crests, but becoming superficial and quite indistinct just behind them. 

 All the regions are distinct and individually tumid. A dimpled oval facet is 

 marked ofi" in the gastro-cardiac angle of either epibranchial region, and 

 between them are two small, somewhat sunken, oval prsecardiac facets. The 

 post-frontal mesogastric groove is well marked. 



Front in the adult about one-third the greatest breadth of the carapace, 

 its sides strongly convergent ; it is little declivous up to its sharp free edge, 

 which is formed more distinctly than usual (as in P. hydrodromus) by the knee 

 of the bend that turns in to make the antennular septum and the eave of the 

 antennular fossae. 



Orbits small, with a very wide antemial gap. External orbital angle broad, 

 prominent beyond and discontinuous with the lower border of the orbit, but 

 not separated from the latter by a distinct notch. 



Antero-lateral borders of carapace well arched, longer than the jDostero- 

 lateral, sharp, indistinctly crenulate or almost entire ; the acute, prominent 

 epibranchial spine is placed very far back. 



Epigastric crests prominent, with the anterior surface rugose, overlapping 

 and slightly in advance of the post-orbital crests ; the latter are thin, trenchant, 



