DUTCH BOHNEO-EXPEDITION. 153 



directed downward, so that the apex is situated a 

 little below the surface of the carapace ; an imaginary line 

 that unites the points of the teeth of the upper margin , 

 appears very slightly convex. The upper margin is armed 

 with 9 or 10 teeth; in the specimens from Nanga Raoen 

 the three first teeth are placed on the cephalo- 

 thorax, the fourth above the orbital margin; 

 in the young individual from the Ketoengau river the four 

 proximal teeth stand on the carapace, the fifth 

 immediately before the orbital margin. The first 

 tooth stands justly before the middle of the cephalothorax 

 and is a little smaller than the following; the teeth are 

 equidistant and they occupy the whole upper 

 margin until the apex. The rostrum is vertically 

 rather low, though not in such a degree as in Pal. pla- 

 cidulus de M. lu the two adult specimens from Nanga 

 Raoen the lower margin of the rostrum presents two 

 well-developed teeth justly in the middle, in the indivi- 

 dual from the Ketoengau river three; the rostrum of 

 the youngest specimen from Nanga Raoen is broken off. 



Examined with a lens , the carapace appears very slightly 

 pubescent, minute microscopical hairs being scattered on 

 it; for the rest it seems to be smooth , not scabrous. The 

 hepatic spine is situated behind and distinctly below the 

 antennal one. The shape of the telsoji is diffe- 

 rent from that of the two preceding species, 

 as may be seen by a comparison of the figures. The t el- 

 son is less elongate, as it is comparatively 

 shorter and broader; it appears broader to- 

 wards the triangular apex, which terminates 

 into a small apical spine. This spine reaches a 

 little farther backwards than the external subtermiual 

 spinules. 



The short flagellum of the internal antennae is distinctly 



serrate. 



The external maxillipedes exceed the antennal peduncle 



with two thirds of their terminal joint , reaching to the 



r^otee froixi the Leyden IMuseuiu , "Vol. XX. 



