DUTCH BORNEO-EXPEDITION. 99 



12 3 4 



9 (/ c/" 9 

 Distance, in the middle line, between the frontal 



margin and the postfrontal ridge 5 4 3 4 



Distance between the outer angle of the front and 



the inner portions of the postfrontal ridge. . . 5 3|- 

 Distance between the outer angle of the orbits and 



the ends of the lateral portions of the postfrontal 



ridge H H ^ 3^ 



Breadth of the mesogastric area 12^^ 13 9 10 



// of the posterior margin of the carapace. .21 15 Hi 15 



Breadth of the orbits 9^ 9^ 7 7.^ 



Height « // // , the margins included . . . 5y 5 4^ 4§- 



Length of the larger cbela 421-39 24i 29 



„ „ palm 22 19|. 131 14' 



Height „ . „ 19^ 16i 10 12^ 



Length of the legs .i 85 75 50 58 



, V meropodites | . 27^ 25V L8 18|. 



Breadth» „ . I'S 7i 7 5| 5| 



Length of the propodites "a ^ 16 14 10 11 



Breadth» "| 5^ 5^ 3| 3| 



Length of the dactylopodites -*^ 18^ 15 lOi 13i 



Breadth» „ » 'S 2 1^ IJ 



N°. 1. Potamon mahakkamense n. sp. ; N^^ 2 and 3 type- 

 specimens of Pot. sinuatifrons H. M. E., habitat unknown, 

 from the Paris Natural History Museum; N°. 4 Female 

 of Pot. sinuatifrons H. M. E. from the Philippine Islands 

 and belonging to the Göttingen Museum. 



Potamon {Potamon) consohrinum^ n. sp. 

 (Plates 6, 9 and 10, Fig. 10). 



Telphusa sinuatifrons Milne Edwards?, Miers, in: Annals 

 and Mag. of Natural History, Ser. 5, Vol.5, 1880, p. 305. 



One male, having lost the chelipedes, collected October 

 1893 by Dr. Hallier on the top of Mount Damoes, Sam- 

 bas, at an altitude of 1100 — 1300 meter. 



One somewhat younger female, without eggs, captured 

 June 1894 in the Upper Sibau river. 



There can be no doubt that these specimens belong to 

 the same species as that which was described by Miers 



Notes from the Leyden IVIuseuiri, "Vol. XXI. 



