DUTCH BORNEO-EXPEDITION. 95 



distance between the epibranchial tooth and the outer 

 angle of the orbits measures justly one sixth, in Pot. 

 sinuatifrons, however, only one ninth of the distance 

 between the outer angles of the orbits, and that distance 

 between the two teeth measures in Fot. smuatifro7is about 

 one third the breadth of the orbits, but in our new spe- 

 cies it is a little more than halfas long as the 

 orbits are broad. The small epibranchial tooth passes into 

 a regularly curved, slightly raised and obscurely granu- 

 late or denticulate crest, that ends about at the level of 

 the posterior boundary of the gastric region, so that the 

 cephalothorax presents its greatest width a little in front 

 of the limit of the anterior third of the upper surface. 

 The postero-lateral margins are straight, rounded and 

 converge as much backwards as in Fot. sinuatifrons; the 

 posterior margin of the cephalothorax finally is slightly 

 concave and measures about one third the breadth of the 

 cephalothorax. 



The whole upper surface appears slightly 

 granulate. The upper surface of the front is densely 

 covered with small, little prominent granules, about '/g 

 mm. broad; similar, though somewhat smaller granules 

 are seen between the orbits and the postfrontal ridge. The 

 anterior branchial area is densely beset, just behind the 

 epibranchial tooth, with granules similar to those of the 

 front and these granules pass gradually backwards into 

 short, granulated, oblique rugae that rather den- 

 sely cover the lateral margin of the carapace; they are 

 longest and most distinct near the middle of the lateral 

 margin and become gradually smaller backwards. Near the 

 cervical and branchio-cardiac grooves the granules and 

 short raised lines gradually grow smaller, more flattened 

 and scarcely prominent at all. Flattened, partly confluent 

 and coalescent granules are observed on the epigastric and 

 protogastric areae and these granules become likewise smaller, 

 more flattened and less salient posteriorly and on the car- 

 diac and intestinal regions. To the naked eye, how- 

 Notes from the Ley den ]Museum, Vol. XXJ. 



