IDUTCH BORNEO-EXPEDITION. 109 



and armed with a short, somewhat flattened spine at the 

 inner angle, below which there is no other. The horizon- 

 tal length of the larger chela is equal to the length of 

 the cephalothorax and this hand is slightly more than 

 twice as long as high ; the fingers are a little shorter than 

 the palm and are, both in the male and in the female, 

 in contact throughout their length. The palm is densely 

 covered with fine granules, that are partly arranged in 

 transverse rows. The fingers are very finely granular, they 

 are marked with longitudinal rows of puncta ; the dactylus 

 is not grooved, but a longitudinal groove is observed on 

 the outer surface of the index, that, however, is rather 

 shallow. 



The ambulatory legs resemble those oi Pot. aiistenianum, 

 so are e. g. those of the penultimate pair 3-times as long 

 as the carapace and the meropodites of this pair are just 

 as long as the cephalothorax. The meropodites and the 

 propodites of the penultimate pair are 5-times as long as 

 broad and the terminal joints are almost as long as the 

 propodites. The meropodites are unarmed at the distal 

 end of their upper margin, that is transversely wrinkled 

 or somewhat granular ; their outer surface is densely punc- 

 tate, though smooth. The ambulatory legs are glabrous. 



The cephalothorax of the three large specimens has a 

 dark bluish-black colour above, below on the sternum and 

 the abdomen it is yellowish; the chelipedes are dark olive 

 green, the fingers have yellow tips and are marked in the 

 middle with one or two narrow yellow stripes. The ambu- 

 latory legs are black with yellow tips. The young indivi- 

 dual is reddish brown coloured. 



Measurements in mm. : 



Greatest width of the cephalothorax 19 21^ 17 



Length „ „ , 14 16 J2^ 



Distance between the external orbital angles 11 12 J 10 



» » the epibranchial teeth 15 17J 13| 



Breadth of the anterior margin of the front 4] 4i| 3| 



Breadth of the posterior border of the carapace .... 8-^ lOJ 8 



Notes from the Leyden M-useum, Vol. XX.1. 



