DUTCH BORNEO-EXPEDITION. 91 



however, by the epibranchial tooth that is rudimentary, 

 presenting itself only as a small obtuse prominence and 

 furthermore by the different form of the abdo- 

 men. The terminal segment with obtuse tip and very 

 slightly concave lateral margins is a little shorter than 

 its base is broad; the penultimate segment is trapezoi- 

 dal, about as long as the terminal. The anterior margin 

 is very little broader, the posterior, however, almost once 

 and a half as broad as this segment is long, so that the 

 straight lateral margins diverge somewhat backwards. 



The meropodites of the ambulatory legs are a little 

 broader and there is no acute tooth at the distal end of 

 their anterior margin. The free border of the front is 

 slightly arcuate, in Pot. silvicola, however, straight. The 

 chelipedes are still equal and feeble, the fingers in contact 

 throughout their length and slightly longer than the palm 

 are distinctly grooved longitudinally, but this is also still 

 the case in the young male from Poetoes Sibau. 



I cannot therefore decide whether this specimen belongs 

 to another species or only ought to be regarded as a va- 

 riety of lot. silvicola. 



Measurements in mm. : ' ^ 



Breadth of the cephalothorax 13^ 



Length „ „ „ 12 



Distance between the outer angles of the orbits 10^ 



Distance between the epibranchial teeth 12i- 



Distance between the outer angle of the orbit and the epibranchial tooth. 1|^ 

 Distance between the free border of the front and the posterior boun- 

 dary of the gastric region 7| 



Breadth of the free border of the front 4|- 



Breadth of the posterior margin of the cephalothorax 7|- 



Breadth of the orbits 2|. 



Height . „ „ 14 



Length of the terminal segment of the abdomen 2-,^ 



• // // penultimate » 2^- 



Breadth of the anterior margin of this segment 2j- 



" // // posterior „ « » ,/ 3g- 



Horizontal length of the chelae 7-J 



« » II .1 fingers 4| 



Height of the palm 24 



iNotes from the Leyden Musexim, Vol. XX.I. 



