DtJTCH BORNEO-EXPEDITION. 67 



The fingers of the chelipedes are dark brown, excepted 

 at the base, with white tips. The cephalothorax, preserved in 

 alcohol, has a light yellowish brown hue, without a trace 

 of the small red spots with which Menippe Panope is mottled. 



Menippe convexa Rathb., from Honolulu, seems to be a 

 closely allied species, but the anterior portion of the rae- 

 sogastric region is defined and the median lobes of the 

 fi'ont are small, separated by a shallow groove, characters 

 not observed in Menippe Ortmanni. The habitat is more- 

 over quite different. 



Measurements in millimeters: 



Greatest breadth of the cephalothorax 19 J 



Length in the median line of the carapace 14 



Thickness of the cephalothorax 9i- 



Distance between the internal orbital angles 5J- 



, » // external » » lOJ- 



Breadth of the posterior margin 5 



Breadth of the orbits 2| 



Height ., „ .. 3 



Horizontal length of the larger chela 17 



„ ,, ,, „ fingers 7 



Height of the larger chela 9 



Horizontal length of the smaller hand 12^ 



H H I, » fingers 6 



Height of this hand 6 



Genus Potamon Sav. 



Subgenus Parathelphusa H. M. E. 



Potamon {Parathelphusa) tridentatum H. M. E. 



(Plate 5, fig. 3). 



Parathelphusa tridentata H. Milne Edwards, in : Archi- 

 ves du Muséum, Tome VII, p. 171, pi. 13, fig. 1. — von 

 Martens in; Archiv fur Naturgeschichte, Jahrg. 34, 1868, 

 p. 19. — de Man, in: Notes from the Leyden Museum, Vol. 

 I, 1879, p. 61. 



15 specimens were collected, viz.: 



1 female at Sanggau. 



Notes from tlie Leyden M.tiseiiin , "Vol. XXI. 



