39 



From the ((ndermiuanwm group it further differs— (4) in the more superficial 

 grooving and smoother sculpture of the carapace ; (5) in the more salient lateral 

 epibranchial tooth ; and (6) in the much less rugose chelipeds. 



Carapace about four-fifths as long as broad, and half (occasionally not 

 quite half) as deep as long, strongly convex fore and aft ; its areolation is as 

 described for andersonianum but all the grooves are more superficial. The 

 anterolateral part of the epibranchial regions is tuberculous or obliquely rugose, 

 the whole postero-lateral part is obhquely rugulose ; the side-walls are obliquely 

 rugose, and the well-defined suborbital lobes are very sparely granulous. The 

 cervical groove is distinct in all its course and cuts the post-orbital crests 

 broadly in the Hne of the inner angle of the external orbital tooth. 



Front strongly deflexed, much less than one-third the greatest width of 

 the carapace ; its edge is smooth, hardly sinuous, and in a dorsal view is 

 quite concealed by a pair of frontal eminences very similar in size and form to 

 the post-frontal crests. Of these frontal eminences there is no indication in 

 the fliimatile and atkinsouianum groups, and hardly a suggestion in the ander- 

 sonianum group. Upper border of orbit sinuous, nearly smooth ; outer orbital 

 tooth distinct but blunt, separated from lower border liy a notch. 



Antero-lateral margins of carapace longer than postero-lateral, raised, 

 gently curved, serrulate, slightly encroaching on dorsum posteriorly; latei-al 

 epibranchial tooth prominent. 



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

 short groove, form the convexity of a common curve with the latter. 



In the male abdomen the length of the 6th segment varies from half 

 to nearly two-thirds its breadth, and the 7th segment is nearly as long as 



broad. 



Antennular fosste narrow ; inter-antennular septum broad. The 1st (true 

 2nd) antennal joint is short and broad, and the two succeeding joints are 

 sometimes overlapped by and in contact with the front, and sometimes in 

 contact but not overlapped. 



The merus of the external maxillipeds is roughly hexagonal and as long 

 as broad ; in other respects the mouth-parts are as described under 



No. 1. 



Chelipeds little unequal; merus with crenulate edges, and an enlarged 

 spine inside the distal end of the inner lower border; carpus with dorsal 

 surface rugulose and fore border a little tumid, and with the usual bicuspid 

 spine at the inner angle ; palm with outer surface rugulose and upper border 

 serrate ; fingers broad, not gaping when closed ; proximal end of upper border 

 of dactylus serrulate. 



Legs of the usual proportions, the 2nd (longest) pair not much surpassing 

 the chelipeds ; the dactyli are longer than their propodites, and the propodites 



