DUTCH BORNEO-EXPEDITION. 405 



cf $ 



Breadth of the posterior margin of this segment 10^ 



Length of the larger chela 24 



« I' m palm 10 



Height » » „ 9 



Length of the legs of the antepenultimate pair 60 58 



// » ,/ meropodites 21 19 



Breadth,, „ „ 6| U 



Length of the propodites 11 Hf 



Breadth „ „ - 5 4 



Length of the dactylopodites 134 12 



Length of the legs of the penultimate pair 62 55 



» H « meropodites 191 18 



Breadth 6| 5^ 



Length of the propodites 11 H 



Breadth of the propodites 5 4 



Length of the dactylopodites 13 11 1 



Length of the legs of the last pair 50 43 



Length of the meropodites 16 14 



Breadth ., „ •> 64 5^ 



Length of the propodites 9^ 8| 



Breadth, „ 6 4| 



Length of the dactylopodites 9| 8 



Potamon (Potamon) Melanippe, n. sp. 

 (Plate 9, Fig. 11). 



Two males and two females were collected on the Liang 

 Koeboeng Mountains, March and April 1894. 



The largest specimen is a female without eggs, the 

 other female somewhat younger and the abdomen of which 

 is still triangular, was found in the forest. The larger 

 male has about the same size as the younger female, the 

 other male is quite young. Perhaps, however, even the 

 largest specimen has not yet attained its full size. This 

 remarkable species has the same enormously long 

 and slender ambulatory legs as Pot. austenianum 

 W.-Mas. from Cherra Piinji, Assam, but it appears to be 

 a different species. As was rightly remarked by Wood- 

 Mason (1. c. p. 204), Pot. austenianum differs from all its 



Notes from the Leyden IVtuseum, Vol. XX.I. 



