DUTCH BORNEO-EXPEDITION. 89 



line of the external maxillipedes is jast as deep and has 

 the same situation and direction. 



The sternum shows another difference. Tn Pot. borneense 

 and its variety hilaris the distance between the anterior 

 extremity of the ischial line and the external margin of 

 the ischium of the outer foot-jaws is always a little 

 broader than the interspace between the anterior extre- 

 mity of the abdominal cavity and the oblique posterior 

 margins of the buccal frame ; in Pot. silvicola, however, 

 these two distances are equally broad. The two 

 transverse furrows on the sternum in front of the anterior 

 extremity of the abdominal cavity are shallow. 



The abdomen has the same form as in the species that 

 was described by von Martens. 



The chelipedes of the male are very unequal, in all the 

 left is the larger ; they agree almost entirely with those 

 of Pot. borneense var. hilaris. The upper margin of the 

 meri bears near the distal end an acute tooth, which in 

 the variety hilaris appears more spiuiform. The hands re- 

 semble also those of this variety and present the same 

 characters; the pointed fingers show, under a strong lens, 

 the same minute granulation and rows of puncta, the 

 toothing of the index is slightly different. The convex 

 outer surface of the palm is smooth and shining, appears 

 finely punctate under a strong lens, but the microscopic 

 granulation is hardly perceptible. In the female the ante- 

 rior legs are equal. 



The ambulatory legs resemble those of Pot. borneense 

 var. hilaris. The meropodites are granular on their outer 

 surface except those of the last pair that are only punctate 

 and their upper margin terminates into an acute tooth, 

 the following joints are also similar in both species. 



The cephalothorax of the males shows above a dark 

 olive-green colour, marked with innumerable small spots; 

 the margins are often ochraceous. The chelipedes are yel- 

 lowish red, as also the lower surface, and like the ambu- 

 latory legs more or less distinctly spotted. 



Notes irom the Leyden IMiiseuna, Vol. XXI. 



