DUTCH BORNEO-EXPEDITION. 107 



posterior margin of the cephalothorax is considerably 

 broader: in the species described by Wood-Masou, an 

 adult female, the breadth of the posterior margin is not 

 yet half as large as the distance between the external 

 orbital angles, but in Pot. Melanippe it measures about 

 three fourth parts of the latter. The merus-joint of 

 the outer foot-jaws has a different form, the external 

 margin being convex ; the ischial line is situated a little 

 closer to the internal margin of the ischium. 



These are the principal differences, I will add still the 

 following. The front has apparently the same shape in 

 both species. The mesogastric furrow is continued on the 

 front, that is strongly deflexed and its rather coarsely 

 punctate upper surface is raised on each side into a slightly 

 convex eminence and the superciliary portions of the upper 

 orbital margins are also longitudinally convex. As the 

 lateral margins of the front converge rather much towards 

 the anterior margin, the front is much wider at the base 

 than at the free border. The latter is slightly bayed in the 

 middle and convex on each side; it forms obtuse rounded 

 angles with the lateral margins. One observes , parallel with 

 the anterior margin of the front and close to it, a very 

 finely crenulate crest or ridge; this crest appears 

 (Figs. 11« and 11*) also concave in the middle, but does not 

 reach to the lateral margins of the front, the lateral ex- 

 tremities being separated from them by narrow fissures. 

 The outer orbital angles are very salient, acute, and pro- 

 ject a little beyond the anterior border of the front (Fig. 11«) ; 

 the outer margin of the extra-orbital tooth has a S-like 

 form , its upper surface is somewhat concave and granular. 



The antero-lateral portions of the branchial region are 

 marked with coarse granulations and the postero-lateral 

 margins show finely granulate, oblique wrinkles. Oblique 

 deep grooves separate the anterior branchial lobe from the 

 protogastric region, but these furrows are not continuous 

 to the semicircular groove, with other words the cervical 

 groove is interrupted. The protogastric regions are also 



Notes Irom the Leyden ]Vtviseu.m , Vol. XXI. 



