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particulars : — The frontal region is tuberculous, as is the anterior half of the 

 gastric region and the anterior half of the epibranchial regions ; and the trans- 

 verse rugae that cross the postero-lateral borders are very abundant. The 

 epigastric crests are very strongly rugulose — the rugai being transverse. 

 The chelipeds are crisply and abundantly rugose ; and their fingers, which 

 are of stout and heavy make, do not gape when closed. 



Its own differentine are as follows : — The carapace is sHghtly deeper and 

 more convex. The numerous tubercles of the anterior part of the dorsum of 

 the carapace are very prominent and often have a whitish pearly lustre, as have 

 the rugosities of the epigastric and post-orbital crests. The epigastric crests 

 and the post-orbital crests form a common curve, the convexity of which is 

 extremely slight. The edge of the front is slightly sinuous, but the free lateral 

 angles are not pronovmced. 



The following is a description of the species : — 



Carapace deep, its deptli being about half its length ; decidedly convex 

 fore and aft, sohd-looking ; its length not quite three-fourths its greatest 

 breadth. 



Except posteriorly, the gastric region is badly defined, and except for the 

 very narrow fore-lobe of the mesogastric area, which deeply separates the tumid 

 epigastric crests, this region is not areolated. 



Except posteriorly, where it delimits the mesogastric area, the cervical 

 groove is extremely superficial and indistinct. 



There is no distinct areolation of the epibranchial regions. 

 The frontal region is thickly beset with small white pearly tubercles, which 

 tend to collect in a pair of transverse swellings like those of P. pealianum ; the 

 epigastric and post-orbital crests have their edge broken by many elongate, 

 transverse and oblique, white imbricating tubercles ; similar tubercles or raised 

 rows of pearly granules cover the anterior half of the epibranchial and gastric 

 regions. The side-walls of the carapace are beset with fine oblique rugse, which 

 abundantly invade the postero-lateral borders, all the rugas being very finely 

 beaded. The suborbital lobes and the outer Hmits of the pterygostomian 

 regions are finely granulous. 



The front in the adult is less than a third the greatest breadth of the 

 carapace and is much deflexed ; its edge is well defined, almost smooth, and 

 faintly sinuous. The outer orbital tooth is well marked, and is sej)arated from 

 the lower border of the orbit by a broad, shallow gap. The antero-lateral 

 borders are hardly as long as the postero-lateral ; they are well defined, 

 finely crenulate, and very gently curved ; the lateral epibranchial tooth is 

 distinct. 



The epigastric crests, though separated from the post-orbital crests by a 

 fissure, form a continuous and very slightly convex cm-ve with them. The post- 

 orbital crests are ragged at their outer end, but they are not distinctly cut by 



