DUTCH BORNEO-EXPEDITION. 123 



inflected inward in the middle, and the small inflected 

 portion is bounded above by an angular crest (Fig. 14*). 

 The outer angles of the front are rounded, they are almost 

 right, so that the lateral margins of the front are nearly 

 parallel, very little convergent. 



The lateral margins of the cephalothorax are S-like cur- 

 ved (Fig. 14). They at first diverge somewhat outward, 

 ascending upwards, so that the cephalothorax appears broad- 

 est anteriorly, along a line dividing the anterior fourth 

 part from the second. This foremost portion of the lateral 

 margin is surmounted by a finely creuulate raised line or 

 ridge and it appears slightly angular at a distance of one 

 millimeter from the extraorbital angle, but there is no 

 trace of an epibranchial tooth. The lateral margins 

 then curve inward and at last again outwards, so that at 

 their posterior extremity, above the legs of the penulti- 

 mate pair, the cephalothorax presents its greatest width 

 (Fig. 14), being here even a little broader than anteriorly. 

 The postero-lateral margins are rounded and marked with 

 oblique raised lines that are continued on the lower sur- 

 face of the cephalothorax ; these lines are altogether want- 

 ing, however, just above the bases of the ambulatory 

 legs. A few short, oblique, finely crenulate raised lines 

 are also seen on the anterior branchial lobe. The upper 

 surface of the cephalothorax is smooth and shining ; exa- 

 mined under an ordinary lens it appears finely punctate, 

 the puncta are more crowded on the posterior branchial 

 and intestinal regions than elsewhere. The front, that is 

 very slightly concave in the middle, appears somewhat un- 

 even near the lateral margins. 



A faint groove separates the branchial floor from the 

 subhepatic region on which one observes a few small ru- 

 gosities, and rather prominent oblique rugae are found on 

 the branchiostegite. The epistome is smooth, the median 

 tooth is narrow, prominent and obtuse (Fig. 14*). The outer 

 foot-jaws (Fig. 14^^) are a little punctate , the puncta on 

 the ischium-joint are somewhat larger than those on the 



Notes from the Leyden JVluseum, Vol. XXI. 



