Boone, Crustacea, Cruises of "Eagle" and ''Ara," 1921-28 189 



with the inner suborbital angle; the first free joint is stout; the sec- 

 ond one is slender, cylindrical ; the flagellum is tapering, multiarticu- 

 late, slightly longer than the eye. 



The external maxillipeds have the ischium nearly as wide as long, 

 the distal margin diagonal, the merus nearly as long as the ischium, 

 with the outer lateral and distal margins produced into a convex 

 lobe; the inner distal margin slightly excavate for the reception of 

 the three- jointed palp, the last two segments of which are compressed, 

 lamellate. 



The chelipeds in the adult male have the ischium short, terminating 

 in an acute spine at the anterior distal angle, the merus is about as 

 long as the width of the body between the bases of the lateral spines 

 and is rather flattened dorsally, the anterior margin armed with six 

 acute, outward-pointing spines of unequal size and spacing, the proxi- 

 mal three being smaller and closer together ; the fifth spine is nearly 

 twice as far from the sixth as the fourth is from the fifth ; the posterior 

 lateral margin bears a single distal spine ; the carpus is short, slender 

 and armed on the upper surface with a subdistal spine on each lat- 

 eral margin; the palm is about one-third as long as the merus, very 

 slender ; armed with an acute spine on the superior basal margin and 

 with another subdistal acute spine on the inner lateral margin; the 

 fingers are fantastically long and slender, exceeding the length of the 

 carapace from tip to tip of the lateral spines by five or six millimeters. 

 The outer lateral face of each finger bears a light carina, as does also 

 the palm ; the cutting edge is set with weak teeth, among which occur 

 at fairly regular intervals slightly larger teeth. The young males 

 have well-developed chelipeds, which are only half to two-thirds as 

 long as those of the adult males. The larger females have the meral 

 joint only three-fifths as long as the width of the body between the 

 base of the lateral spines; the propodus has the palm and fingers of 

 equal length, the fingers being equal to scarcely one-third the maxi- 

 mum width of the body. 



The first, second and third ambulatories are very slender ; the first 

 and third pairs are subequal in length ; the second pair exceeds these 

 by half the length of its dactyl; the third pair is even frailer than 

 the other two pairs. All have the dactyli sabre-like, acuminate, ap- 

 proximately as long as the related propodus. 



The natatory legs are the stoutest and shortest of the series; the 

 suboval meral joint has a single subdistal spine on the posterior lateral 



