new River- Crah from Yunnan. 157 



as the postero-lateral. The extra-orbital tooth is flattened, 

 with a slightly convex and minutely serrate outer edge. It 

 is followed by five or six teeth, which may be unsymmetrical 

 on the two sides of the carapace. They are slender, spini- 

 form, nearly straight, widely separate from each other, and 

 standing nearly at right angles to the margin. The third or 

 fourth is the longest, and the last is very small or may be 

 absent on one side. 



The lower surface of the carapace is nearly smooth and the 

 hepatico-branchial groove is ill-defined. 



Fia-. 2. 



rarathelphusa sjnnescens. a. Abdomen of male. b. Tliird maxilliped. 



The ischium of the third maxillipeds (tig. 2h) has a well- 

 marked longitudinal groove. Tlie raerus is distinctly broader 

 than long, the antero-external angle rounded and the anterior 

 margin slightly convex. 



Abdomen of male (fig. 2 a) with straight sides, converging 

 but little to the base of telson, which has nearly the form of an 

 equilateral triangle, the apex rounded and the sides concave. 



Merus of chelipeds with a series of granules on its upper 

 edge, leading to a subterminal spine ; lower edge rounded off, 

 with some obsolescent granules and a subterminal tubercle. 

 Carpus bearing two stout unequal spines internally. The 

 light chela of the male is quite smooth, its height equal to 

 the length of the fingers and two thirds of its length. The 

 dactylus is slightly arched, so that the fingers gape a little 

 when closed, and is very obscurely furrowed. The left chela, 

 like both chela? of the female, has the daCtylus nearly 

 straight and the fingers about three fourths the length of the 

 palm. The ambulatory legs are moderately long, the merus 

 without a spine on the upper edge. The dactylus of the 

 second pair is equal to the j)ropodus, those of the other pairs 

 are distinctly shorter, and all are strongly spinulose on the 

 upper surface. 



The carapace of the male specimen is 295 ram. in length 

 and 37 mm. in breadth ; that of the female is a little smaller. 



The colour (in spii'it) is ycllowisli, and the upper surface 



