DUTCH BORNEO-EXPEDITION. 143 



X ;i; éb abdomen and anterior extremity of the sternum of this spe- 

 cimen, X h 4c outer maxillipede, x Ï; 4-d right or larger chela of the 

 same male, X i- 



Plate 6. 



Fig. 5. Fotamon {Perithelphusa) Biittikoferi n. sp., adult male, X 2 ; 5fl 

 dorsal view of the anterior part of the carapace of this specimen, X 2; 56 

 cephalic region of the same male from before, X 2; 5«: outer foot-jaw, 

 X 2; 5(5? distal half of the abdomen and anterior part of the sternum of 

 the male, X 2 ; 5e larger chela of adult male, X 2. 



Fig. 10c?. Poiatnon {Potamo)i) consobrinum n. sp., front of the male from 

 Mount Damoes from above, X 2; lOe the same of the female, x 2. 



Plate 7. 



Fig. 1. Myomenippe Leguilloui A. M. E., cephalothorax of an adult 

 male, type-specimen from the Paris Natural History Museum, collected 

 by Leguillou in the //Mer des Indes", X <'. 



Fig. 6. Fotamon {Perithelphusa) silvicola n. sp., adult male, X |; 6a 

 external maxillipede and anterior part of the sternum of the male x 2 ; 6i 

 larger chela of adult male, X 2. 



Fig. 7. Potamon sp., dorsal view of the anterior part of the cepha- 

 lothorax of the male, x 3; 7« abdomen, X 3. 



Plate 8. 



Fig. 8. Potamon {Potamon) mahakkamense n. sp., dorsal view of the 

 anterior part of the carapace of adult female, x ] ; 8a cephalic region 

 of this specimen from before, X ] ; 86 front from above, X 2 ; 8c external 

 maxillipede, x ! ; 8c? larger chela of the same specimen, x ]• 



Fig. 9. Potamon {Potamon) sinuatifrons H. M. E., dorsal view of 

 the anterior portion of the carapace of the largest male, 53 mm. broad, 

 type-specimen from the Paris Natural History Museum, X 2; 9a front 

 of this specimen from above, x 2. 



Plate 9. 



Fig. 96. Potamon {Potamon) sinuatifrons H. M. E., dorsal view of 

 the anterior portion of the cephalothorax of a male, 36 mm. broad, type- 

 specimen from the Paris Natural History Museum, x 2; 9c posterior 

 margin of the epistome of this specimen, X 4- 



Fig. lOA. Potamon {Potamon) consobrinum n. sp., dorsal view of the 

 anterior part of the carapace of the male from Mount Damoes, X 2; 10c 

 the same of the female from tbe Upper Sibau river, x 2; 10/ posterior 

 margin of the epistome of the male, lOy of the female, X 2. 



Fig. 11. Potamon {Geothelphusa) Melanippe n. sp., female, X 2; 11a 

 dorsal view of the anterior portion of the carapace of this specimen, 



Notes from the Leyden Museum, "Vol. XJlLI. 



