DUTCH BORNEO-EXPEDITION. 129 



The front is almost vertically deflexed downward, appears 

 very slightly concave in the middle and its height, in the 

 middle, measures one third the breadth of the free bor- 

 der. The front projects a little more forward than the 

 outer angles of the orbits. 



The lateral margins of the cephalothorax are regularly 

 arcuate. The antero-lateral margin is raised into an ob- 

 scurely denticulate crest that curves a little inward there 

 where the cephalothorax is broadest. There is even no 

 trace of an epibranchial tooth. The postero-lateral 

 margins that are straight, converge slightly backwards, so 

 that at their posterior extremity , above the base of the 

 legs, the cephalothorax is still almost once and a half as 

 broad as measures the distance between the external orbi- 

 tal angles; the postero-lateral margins are rounded and 

 marked with 8 or 9 short oblique, raised lines. The pos- 

 terior margin of the cephalothorax that is somewhat con- 

 cave in the middle, is just twice as broad as the free 

 border of the front and but little less broad than the 

 distance between the external orbital angles. 



The upper surface of the cephalothorax is smooth and 

 shining; examined under a lens one observes everywhere 

 a fine punctation, the puncta are more numerous on the 

 cardiac and posterior branchial regions than anteriorly and 

 are rare on the mesogastric area. Near the antero-lateral 

 margins a few oblique wrinkles are more or less distinct, 

 but a granulation is nowhere observed; on the 

 front and just behind the orbits a few larger puncta are 

 distributed. The free border of the front and the upper 

 margin of the orbits are quite smooth. In a front view of 

 the cephalothorax (Fig. IS'^), the oval orbits appear so me- 

 what oblique; they measure two thirds the breadth 

 of the frontal margin and are about half as high as 

 broad. The regularly arcuate and obscurely crenulate 

 lower margin presents no hiatus near the outer angle and 

 the inner angle is not dentiform, not at all prominent. 

 The eye-peduncles are smooth, punctate. 



IS'otes ft'om the Leyden ]Miiseu.m , Vol. XXI. 



9 



