82 CRUSTACEANS OF THE 



free border of the front. The epibranchial teeth are wi- 

 dely distant from the external orbital angle, though 

 the distance between the latter and the tip of the epibranchial 

 tooth is a little shorter than in the preceding species, 

 measuring in the adult male one sixth the length of the 

 whole lateral margin. The outer border of the extraorbital 

 tooth is in most specimens almost straight, with no ob- 

 tuse angle in front of the notch that separates it from 

 the epibranchial tooth ; the third male, the carapace of 

 which is 30 '/a ïUQi- broad, resembles, however, in the form 

 of this outer border, Pot. borneense var. hilaris. The 

 epibranchial tooth is acute, with a brown point, directed 

 forward and slightly inwards, but these teeth are some- 

 what smaller than in the other species. Otherwise as in 

 the latter, in which the distance between the epibranchial 

 teeth is almost as large as the greatest width of the ce- 

 phalothorax, the lateral margin runs, behind the epibran- 

 chial tooth, obliquely outwards so that the branchial 

 lobe bulges out laterally with a convex outer margin; 

 the greatest width of the cephalothorax is situated along 

 a line dividing the anterior from the middle third of the 

 upper surface. The oblique raised lines on the slightly 

 concave postero-lateral margins are a little less nume- 

 rous but more salient than those of the variety hilaris 

 of the preceding species. The whole upper surface is finely 

 and closely punctate, on the cardiac and mesogas^vic areae 

 the minute puncta are less numerous. The posterior margin 

 of the cephalothorax is, at least in the adult male, i. little 

 less broad with regard to the greatest width of the cepha- 

 lothorax than in Pot. borneense var. hilaris. 



The orbits are small, slightly oblique in a front view 

 and little broader than high; in a front view the sinuous 

 course of the upper margin is well visible, the lower margin 

 is regularly curved, without a notch or hiatus near the 

 outer angle and the obtuse inner angle is very small, 

 scarcely prominent and widely distant from the front. 



The nasal plate is somewhat broader, but less 



JNotes from the l-.eydeii IMuseum, "Vol. XXI. 



