104 CRUSTACEANS OF THE 



is obtuse. The penultimate segment is a little shorter, its 

 posterior margin is somewhat more, the anterior a little 

 less than once and a half as broad as this segment is long 

 and the lateral margins are nearly straight. 



The anterior legs are unfortunately lost. The joints of 

 the ambulatory legs are slightly broader in proportion 

 to their length than in the female from the Upper Sibau, 

 the dactylopodites, however, even those of the 5*b pair, 

 fully agree. 



Both specimens have the same colour. The upper sur- 

 face of the cephalothorax and of the ambulatory legs is 

 olive-green, the free border of the front, the orbital and 

 the antero-lateral margins are yellow, the lower surface 

 presents the same colour though lighter; the anterior legs 

 of the female are reddish with a greenish hue and the 

 extremities of the fingers are dark brown. 



I suppose that the described differences will prove to 

 be individual or sexual or a consequence of different age, 

 when a large series of specimens from the same localities 

 once will be examined. 



Measurements of the two specimens of Pot. consobrimim : 



Breadth of the cephalothorax 45 39 



Length » » „ 33 29 



Distance between the external orbital angles 30 24 



Breadth of the frontal margin 14 9| 



Distance between the epibranchial teeth 38 30 



Distance between the ext. orbital angle and the epibranchial tooth. 5 3 

 Distance, in the median line, between the frontal margin and 



the postfrontal ridge 3V 3 



Distance between the outer angle of the front and the internal 



portions of the postfrontal ridge 4^ 3^ 



Distance between the outer angle of the orbits and the post- 

 frontal ridge 41 31- 



Breadth of the mesogastric area 12 iOl 



Breadth of the posterior margin of the carapace 13' 13 



Breadth of the orbits 8 7 



Height » ,, ., 4| 4 



Length of the terminal segment of the abdomen 1\ 



n „ penultimate » » » » 6V 



Breadth of the anterior margin of this segment 9 



Notes from the Leyden Miuseum, "Vol. iXXI. 



