219 



another, so that the greater part of the abdomen is soft : the 6th tergum is 

 deeply grooved transversely and feebly grooved longitudinally, the telson is 

 obscurely and asymmetrically bilobed posteriorly. 



Ophthalmic scales spiniform, acute : the eyestalks, which are dorsally setose, 

 are about half the extent of the frontal border of the carapace in length : the 

 eyes are small. 



The antennular peduncle is about as long as the carapace, its third joint 

 being by far the longest : the upper antennular flagellum, which is much longer 

 than the lower, is hardly half as long as the peduncle. 



The antennal peduncle reaches only as far as the end of the 2nd joint of the 

 antennular peduncle: the acicle, which is setose and slightly twisted, reaches to 

 or beyond the end of the antennal peduncle : the flagellum is about twice as long 

 as the body. 



The external maxillipeds reach some way beyond the end of the antennal 

 peduncle : they are setose and the inner border of the ischium is toothed : the 

 sternum between them carries a pair of spines. 



The great chelipeds are thickly tomentose, especially the distal end of the 

 merus, both surfaces of the carpus, and the outer surface of the hand, and the 

 right is much longer and very much bulkier than the left. 



In the adult, the right cheliped is considerably longer than the body, 

 between half and two-fifths of its length being contributed by the hand, which is' 

 also the broadest joint : the carpus, which is the next largest joint, is as long as 

 the palm, and the dactylus is shorter than the palm : the inner border of the 

 ischium is crenulate, the upper surface of the trigonal merus is rugose, and the 

 subcylindrical carpus and the compressed but tumescent palm are°gra'nular : on 

 the cutting-edge of the fingers are 2 or 3 molariform teeth. 



In the adult, the small left cheliped is about as long as the right cheliped 

 minus the hand : the carpus is nearly as long as the hand, the dactylus is a little 

 longer than the palm, and there are no enlarged teeth on the cutting-edge of the 

 fingers. 



The 2nd and 3rd pairs of thoracic legs are very long, rather slender, smooth 

 and compressed : their dactylus, which is the longest joint, being longer than 

 the carpus and propodite combined, is curved and slightly twisted and is more 

 or less covered with stiffish setse : the 3rd pair, which are a little longer than the 

 2nd, reach almost a dactylus length beyond the tip of the large cheliped. 



The legs of the 4th pair are about two-thirds, and those of the 5th pair are 

 about three-quarters, the length of the carapace measured in the middle line : in 

 both, the dactylus is a minute claw, and both are setose, especially at the far 

 end of the propodite, where, on the outer surface, is a rasp-like patch or strip of 

 granules. 



