228 Surg.-Capt. A. Alcock on 



The stout peduncle of the antennae reaches almost to the 

 ]ioint of the rostrum ; the anteiinal scale is broadly petal- 

 shaped and is closely fringed with long seta? on its inner and 

 front margins ; its outer margin does not end in a spine ; the 

 second joint has the outer margin sharp, ending in front in 

 a spine, while the third, fourth, and fifth joints have the inner 

 margin sharp and fringed with sets ; the flagcllum is nearly 

 one half longer than the entire animal. 



The mouth-parts present nothing remarkable. 



The chelipeds are equal and uniform in the female and in 

 small males, and even in large males the preponderance of 

 one side (the right in two specimens) is but slight; their 

 entire length is very nearly half the total length of the 

 animal : the basipodite is fused with the ischiopodite, which 

 is smooth, with a faintly granular ridge on the obtuse inner 

 margin : the meropodite is more than twice the length of the 

 ischiopodite and is triangular in transverse section ; the inner 

 surface is smooth, the outer surfaces are slightly granular ; 

 the upper and lower borders are sharp and sharply spinate 

 and end in front each in a great spine ; the outer border is 

 rounded and is produced in front into a long blunt spine : 

 the carpus is more than half the length of the meropodite 

 and is prismatic in shape, with the angles more sharply 

 granular than the surfaces ; three of its angular borders — tlie 

 two inner and the outer — end in large spines, the last having 

 a second large spine at its proximal end : the entire propodite 

 is at least twice the greatest length of the meropodite, the 

 "finger" constituting about half of the total length of this 

 joint; the " palm " of the propodite has the usual prismatic 

 form, with the angles salient and strongly spinate and the 

 surfaces between the angles smooth or faintly creiiulate, but 

 never pubescent ; its " linger " portion has a sharply granular 

 surface and bears internally a row of teeth, of which one near 

 the proximal end is conspicuously largo, standing between 

 two thick rows of seta3 : the dactylopodite is equal and similar 

 to the finger of the propodite, except that (1) its surtace 

 distally is rather less granular, (2) instead of one large tooth 

 near the base there are several, and (3) the sette do not flank 

 the teeth except quite at the proximal end of the joint, but 

 form a long brush all along the under surface of the dactjdus. 



Of the remaining thoracic legs, all of which are slender 

 and cylindrical, the longest is the fourth pair, which are not 

 quite two thirds the length of the first pair, and the shortest 

 are the fifth, while the second and third arc chelate. 



The branchial formula is — 



