's RIJKS M USEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 171 



bases of the penultimate pair of legs. The posterior margin of the carapace 

 is equal to the breadth of the front and 2 / 5 of the maximum breadth of 

 the carapace (between the tips of the posterior epibranchial teeth). The 

 front agrees with that of P. granulosus: it has three emarginations, the 

 median broader and shallower than the lateral, and the external angles 

 of the front are projecting and subacute. The orbits are subcircular in 

 front view; the upper orbital border is less oblique than in the foregoing 

 species, but the granulated, raised line beneath the inferior orbital border, 

 the similar line bordering the frontal margin of the buccal cavern, and 

 the hairy pterygostomian regions are the same in both species. The epis- 

 tome is somewhat less deep and less concave in longitudinal direction in 

 the present species. The whole carapace is, as in the preceding species, 

 bordered by granules, that are finest at the posterior margin; the surface, 

 on the contrary, is not granulated, but everywhere finely pitted, 

 most densely so on the cardiac, intestinal and branchial regions, the 

 strongly sloping sides of the latter are not pitted, but somewhat granulated, 

 and the transition of sculpture is marked by an oblique, interrupted row 

 of granules ; a similar row occurs above the base of the last pair of legs. 



The front has the same four groups of granules as in the preceding 

 species: two median, on the projecting inner lobes of the front, and two 

 lateral ones, that are much larger and longitudinally developed, above the 

 bases of the short and thick eye-stalks. The postfrontal lobes, on the proto- 

 gastric region, are likewise provided each with a group of granules. 



The external maxillipeds are finely pitted, naked, not hairy, as in P. 

 granulosus, the ischium has a deep longitudinal groove, is longer than the 

 merus, and somewhat narrower than the exognath (fig. la); 

 the latter reaches nearly to the anterior margin of the strongly auricu- 

 lated external part of the merus, that is much broader than long. 



The abdomen of the male presents only slightly-converging margins, so 

 that the base of the penultimate segment is more than half the breadth of 

 the first; the margins of the penultimate segment are subparallel in the 

 proximal two-thirds of their length and then abruptly curve inward 

 towards the base of the terminal joint, so that the base of the latter is 

 slightly more than half the base of the penultimate joint; the 5th, 6th 

 and 7th segment are of nearly equal length, longer than the 4th segment ; 

 the side margins of the terminal segment are slightly concave, and the 

 segment is as long as broad at the base. 



The chelipeds of the male are of equal size (though this is not indicated 

 in the figure). The meropodite is very short and thick, does not project 

 beyond the carapace and is entirely hairless; inner and under surface 

 are smooth, but the outer surface shows numerous transverse rows of 



