56 BULLETIN OF THE 



the rostrum : the first segment is squamiform, about oree and two thirds as 

 long as the two distal segments together, about three sevenths as broad as long, 

 and the outer margin is armed with an acute tooth near tbe middle and pro- 

 jects distally in a similar tooth half as long as the second segment ; the second 

 and third segments are subequal in length, the second less than half as wide as 

 the first but with a slight carina-like expansion on the outer side, while the 

 third is still narrower and nearly cylindrical. The outer ilagellum is divided 

 for nearly half the length of the outer portion, which is as long as the peduncle, 

 rather stout and somewhat hairy, while the inner ramus is more slender, 

 nearly naked, and extends more than half the length of the whole flagellum 

 beyond the tip of the outer ramus. The inner flagellum is very slender and 

 apparently a little shorter than the outer, but is imperfect at the tip. The 

 antennal scale (Fig. l b ) is about as long as the rostrum, more than a third as 

 broad as long, only very slightly narrowed distally, and the broad obliquely 

 truncated and rounded tip extends considerably beyond the large and acute 

 spine in which the outer margin terminates. The terminal segment of the 

 peduncle is slender and about two fifths as long as the scale. The flagellum is 

 nearly as long as the whole body of the animal. 



The external maxillipeds reach to the middle of the antennal scales and are 

 very slender ; the first of the three segments of the endopod reaches to the front 

 edge of the carapax, and the second and third are successively a little shorter. 

 The exopod is slender and reaches a little by the first segment of the endopod. 

 The two pairs of chelate legs are unsymmetrical, the legs of the left side being 

 larger than those of the right. This is very likely accidental, however, for the 

 right antennal scale is short and misshapen, evidently reproduced after injury, 

 and the right chelate legs have very likely been reproduced also, although they 

 are as well formed as the left ones. The left leg of the first pair is about as 

 long as the carapax including the rostrum ; the merus and carpus slender and 

 subequal in length ; the chela nearly as long as the carpus, and slender, six or 

 seven times as long as broad and with slender and slightly curved digits nearly 

 half the whole length. The right leg is slightly smaller than the left, but the 

 proportion of the parts the same. The left leg of the second pair is once and a 

 half as long as that of the first pair ; the ischium and merus are subequal in 

 length, the latter reaching as far forward as the tip of the rostrum ; the carpus 

 is a little more than half as long as the merus, and shorter than in the first pair ; 

 the chela is nearly as long as the carpus and merus together, slender, though 

 slightly swollen in the middle, and with slender digits about two fifths the 

 whole length. The right leg is about a fourth shorter than the left, and slender 

 in proportion. The third and fourth pairs of legs are alike, slender, about a 

 third longer than the carapax including the rostrum, the carpi about two thirds 

 as long as the meri, the propodi considerably longer than the carpi, and the 

 dactyli slender, slightly curved, acute, and only a sixth or seventh as long as 

 the propodi. 



The epiineron of the first somite of the abdomen is very broad, but little 

 narrower than that of the second, and extends far forward by the posterior edge 



