33 



(1) The superficial sculpture of the carapace is coarser and more abundant ; 



(2) The gastric region is usually well areolated, the mesogastric region 

 at least being distinctly circumscribed in all its extent ; and the areolae of the 

 epibranchial regions are much more sharply defined ; 



(3) The upper surface of the carpus is umbilicated, the anterior edge of 

 the surface being tumid ; and, except in very old males, the fingers of the 

 chelipeds when closed have their cutting edges in close apposition throughout. 



Carapace : length from four-fifths to almost three-fomths its greatest 

 breadth, depth about two-fifths its length ; quite flat behind the frontal slope. 

 The gastric region is extremely well defined : often all its areolse are distinctly 

 demarcated, and the mesogastric areola at least is always distinctly circum- 

 scribed by a groove in all its extent. Each epibranchial region is distinctly 

 cut into four unequal areolae by deep grooves, one of which grooves is 

 obliquely transverse and the other is roughly parallel with the cervical groove. 

 The cervical groove is broad and deep, and cuts the post-orbital crests at a 

 point almost in line with the inner angle of the external orbital tooth. The 

 frontal and the anterior half or more of the gastric region are tuberculous or 

 rugose ; the anterior half of the epibranchial regions is strongly tulierculous or 

 obliquely rugose ; the posterior part of the epibranchial regions, on and near 

 the postero-lateral borders, is rugulose ; the sidewalls of the carapace are 

 obHquely rugose, the ripple-like markings becoming coarser and more 

 tuberculous anteriorly; the well-defined suborbital lobes are smooth or 

 sparsely tuberculous. 



Epigastric crests separated from the post-orbital crests, and forming the 

 gentle convexity of a common curve with them ; not more tumid or less 

 rugose than the post-orbital crests. 



Front Httle declivous, its edge sinuous and faintly bilobed, its width less 

 than one-third the greatest breadth of the carapace, its edge well defined and 

 faintly crenulate. The external orbital tooth is well indicated Init not 

 spiniform, and is separated from the lower border of the orbit by a notch. 



Antero-lateral borders of the carapace about as long as the postero-lateral, 

 raised, serrulate, gently cmwed, not encroaching much on the dorsum 

 posteriorly ; the lateral epibranchial tooth is distinct but not large. 



In the adult male abdomen the length of the 6th segment varies from a 

 little over half to nearly two-thirds its greatest breadth, and the 7th segment 

 is nearly as long as broad. 



Antennular fossae very narrow fore and aft ; inter-antennular septum very 

 broad, formed about equally by epistome and frontal callosity. First (true 2nd) 

 antennal joint squarish, the two succeeding joints covered by and in contact 

 with the front. 



Mandibles and external maxillipeds in a general way as described under 



E 



