53 



Carapace deepish, decidedly convex fore and aft, its length about three- 

 fourths its greatest breadth, its depth approaching half its length, its anterior 

 third to half is as rugose as that of brevimarginatum and pruinosum, its areola- 

 tion is like that of hrevimarginattmi but fainter ; the side-walls, suborbital 

 lobes, and pterygostomian regions are abundantly rugose. 



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

 its surface granulous, its edge faintly bilobed and sinuous. 



Outer orbital tooth obsolete, merely a callosity ; no gap between it and the 

 lower border of the orbit. 



Epigastric and post-orbital crests blunt and rugose, forming a single 

 curve, but separated from one another ; post-orbital crests not cut by the 

 cervical groove, but not continuous with the lateral epibranchial tooth. 



In the male abdomen the length of the 6th segment is between half 

 and two-thirds its greatest breadth, and the 7th segment is as long as 

 broad. 



Mouth-parts normal ; merus of external maxillipeds broader than long. 



Chelipeds unequal, their extensor surface rugose ; the palm, especially that 

 of the larger cheliped, is somewhat swollen in its lower outer part, and the 

 fingers, which are shorter than the palm, gape somewhat. 



Legs about as long as the chelipeds ; edges of propodite and dactylus 

 rather hirsute. 



In the largest specimen, a female, the carapace is just over fths inch 

 long, just over 1 inch broad, and just over «ths inch deep. A smaller 

 specimen than this has eggs in its pouch. 



Ex 



PoTAMON (Potamon) stoliczkanum, Wood-Mason. 



Telphusa stoliczhana, Wood-Mason, Journal Asiatic Soc, Bengal, XL., part II., 1871, p. 199, pi. xii., figs. 8-12. 

 Potamon {Potamonautes) stolkzkanns, Mary J. Rathbun, Nouv. Archiv. du Museum, Paris (4), VII., 1905, 

 p. 187 {ubi lit.), not fig. 7, pi. xv., in Tom. VI. 



In this species the mandibular palp, as in all the preceding species, is quite 

 simple, not bilobed. The species has no close relations with P. cmicularis, 

 guerini, and planatus, but, as Dr de Man mentions, comes very near P. 

 Iwrnaudii. 



Carapace slightly convex fore and aft, its length about three-fourths its 

 greatest breadth, its depth somewhat more than two-fifths its length, its surface 

 finely pitted but otherwise remarkably smooth, there being only a few short 



