108 CRUSTACEANS OF THE 



finely granular, the granules gradually decrease in size 

 backwards and change into impressed puncta on which 

 microscopical hairs are inserted, so that the metabranchial, 

 cardiac and intestinal areae appear densely punctate. The 

 posterior margin of the carapace is slightly concave. 



The finely crenulate lower margin of the orbits shows no 

 hiatus or incision near the external orbital angle, is regu- 

 larly arcuate and the inner angle is obtuse. The posterior 

 margin of the epistorae (Fig. 11^) is smooth and the trian- 

 gular, rather obtuse tooth in the middle is separated by 

 narrow fissures from the lateral parts that run like a S. 



The branchial floor is covered with oblique wrinkles, 

 the subhepatic region is also somewhat rugose and parallel 

 rugae are seen on the brancbiostegite near the boundary 

 of the subhepatic area. The merus-joint of the outer foot- 

 jaws (Fig. 11^) is quadrate, its anterior margin is straight 

 or a little concave, the outer margin convex; the ischial 

 line runs near the internal margin of the ischium, some- 

 what obliquely and does not reach the anterior margin. 



The male abdomen (Fig. 11^) bears some resemblance to 

 that of Pot. borneense v. Marts, var. hilaris. The terminal 

 joint is once and a half as long as broad at the base, has 

 a rounded extremity and its margins are slightly concave 

 posteriorly. The penultimate joint is a little shorter, quadrate, 

 as long as broad anteriorly and its posterior margin is a 

 little less broad than the anterior. Sternum and abdomen 

 are densely punctate. The abdomen of the largest female 

 resembles that of Fot. stoliczkanum (Wood-Mason, 1. c. pi. 

 XII, fig. 10), but the terminal joint is triangular, its length 

 being in proportion to its breadth at the base like 4 : 7. 



Like those of Pot. austenianum, the chelipedes are un- 

 equal, either the right or the left being the larger; they 

 seem to agree in both species. The upper margin of the 

 meri carries transverse or oblique wrinkles and is unarmed 

 at the distal end ; the margins of the lower surface that 

 bears no tubercle near the articulation of the wrist, are a 

 little tuberculate. The wrists are granularly rugose above 



Notes from tlie Leyden Mviseum, Vol. XXI. 



