214 J. G. DK Man : The Fauna of Brackish Ponds. [Vol. II, 



measuring two-thirds the greatest width. External maxillipeds 

 shutting closely together. Ischium a little broader than long, its 

 antero-internal angle produced, antero-external corner situated 

 lower than the rest of the surface and bounded b}^ a hairy line 

 that runs obliquely from the outer margin to the antero-internal 

 angle. Merus a little longer than the ischium and, though slightly 

 broader than long, hardly as broad as the latter ; this joint is 

 sculptured with a sort of Y-shaped sulcus starting from the antero- 

 external angle, as in Tymp. orientalis, but the outer branch is 

 shorter and reaches hardly beyond the middle of the joint. Car- 

 pus ovate, concave, two last joints cylindrical. The outer margin 

 of merus and ischium combined is regularly arcuate. Bxognath 

 completely concealed. 



Sternum and abdomen are smooth. The abdomen (fig. id) 

 of the male, which somewhat more resembles that of Tymp. orientalis 

 than that of Tymp. pusillus, is 7-jointed. The terminal or seventh 

 segment is, in the adult male, i"5 mm. long,' and its posterior 

 margin is i"35 mm. broad ; the lateral margins are a little concave 

 and the tip is rounded. The penultimate segment, I'l mm. long, 

 is a little shorter than the terminal, and as its lateral margins are 

 convex, it presents its greatest breadth of i"88 mm. in the middle, 

 appearing almost twice as broad as long. The fifth joint is 1*52 

 mm. long, i.e., as long as the terminal segment, and, being strongly con- 

 stricted just behind the middle, appears tinie-glass-shaped ; the anterior 

 margin of this joint is i"6 mm. broad, the posterior 1*72 mm, and at 

 the constriction it is i*i mm. broad. The fourth joint is 0*96 mm. 

 long, two-thirds of the preceding and its straight, posterior margin, 

 2*52 mm. broad, is 2-|^-times as broad as this joint is long. The 

 third joint is i'i4 mm. long, a little longer than the fourth, and, as 

 its margins are somewhat arcuate, it is yi mm. broad, also two 

 and a half times as broad as long, like the preceding segment. The 

 second segment is very short, 0*62 mm. long, half as long as the 

 third and 276 mm. broad. The first joint, finall}^, is the shortest 

 and the broadest of all, o"32 mm. long and 3*2 mm. broad ; the 

 posterior margin of the sternum, however, between the coxse of the 

 fifth legs, is 4"6 mm. broad. 



The broad abdomen of the female much resembles that of Tymp. 

 pusillus ; the terminal joint, which is rounded at the tip, is 1*04 mm, 

 long and its posterior margin is i'9 mm. broad. 



Chelipedes equal both in the male and in the female. The 

 chelipedes of the male (fig. i) more resemble those of Tymp. 

 Pusilhts (de Haan) than those of Tymp. orientalis ; they are just 

 twice the length of the carapace and are thus rather short. The 

 margins of the arm are unarmed, but they are granular, especially 

 the upper one, the outer surface is nearly smooth, though a few 

 microscopical granules are scattered on it, mostly near the upper 

 margin ; the granules are only visible b}^ means of a lens. The upper 

 surface of the carpal joints, which resemble those of Tymp. pusillus, 



^ All the joints are measured in the middle. 



