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obliquity ; the posterior margin has a pair of spines, one on either side of the 

 middle line ; the lateral margins are armed each with five spines. The gastric 

 area is very distinctly delimited and is armed in front with two (and only two) 

 spines, which stand immediately behind the supraorbitals and are about a third 

 the length of these. The cardiac area also is very distinctly defined, and is 

 surmounted centrally by a large spine and flanked on each side, just behind the 

 bifurcation of the cervical groove, by a similar spine. The transverse ridges 

 are well developed and are strongly and sharply beaded and thickly and very 

 finely setose. 



The abdominal terga also are most beautifully sculptured with similar ridges, 

 transverse and concentric ; the second, third and fourth terga are armed on their 

 anterior margin each with four distant spines, the middle pair of which are large 

 and conspicuous, and the fourth also has in its hinder portion and in the middle 

 line a single spine. 



The eyes are large, their major diameter being more than one-fourth the 

 length of the carapace, and the eye-stalks on the upper surface have several 

 setose squames ; the corneal region is compressed and closely fringed with setae 

 at base. 



The spines on the basal joint of the antennules are not large, only the outer 

 terminal spine and the anterior of the two marginal spines being of noticeable size. 



The antennal peduncles are scaly ; the basal joint has a small tubercle at its 

 internal angle, and the second and the third joints have each a spine in the same 

 situation ; the flagelhim is very little longer than the chelipeds. 



The external maxillipeds are very hairy and have the exposed surface of the 

 ischium and merus scaly, the former joint being serrated, up to a large terminal 

 spine, along the inner edge, and the latter having a similar spine near the middle 

 of the inner edge. 



The thoracic legs are long, slender, aud most remarkably squamous, the 

 scales being fringed with fine setae. The chelipeds, which are relatively both 

 stouter and longer in the male, are in that sex one-third of their own extent 

 longer than the body with the rostrum, being also a little unequal ; the merus, 

 which is almost square in transverse section, has three regular rows of spines on 

 its upper and inner face ; and the carpus and propodite, which are almost 

 cylindrical, have each two irregular rows of spines on the inner face, the pro- 

 podite also having two or three spines on the outer aspect ; the fingers are about 

 two-thirds the length of the palm and are finely toothed, the fixed finger having 

 a second series of 5 or 6 large teeth and ending in a pair of claw-like spines, 

 betAveen which the tip of the dactylus shuts. 



Of the second, third, and fourth thoracic legs the merus has both edges 

 spiny, the anterior the more markedly so ; the carpus has the anterior edge 



