1170 



CRUSTACEA. 



uncinate spine near middle, finger very slender, spatulate, and 

 concave at apex. Caudal stylets long, divaricate. 



Plate 82, fig. 5 a, animal, enlarged; a', extremity of female an- 

 tenna; b, part of male right antenna; e, profile of head; d, front 

 view of beak ; e, abdomen of a male ; /, profile of female abdomen ; 

 g, another female abdomen, upper view ; h, lips ; i, view of mandible ; 

 /, mandible (in another position) and its palpus ; k f maxilla ; Z, right 

 posterior foot. 



Collected several individuals, February 1 and 5, 1840, in the Pacific, 

 north of the Samoan Islands, latitude 11°-12° 45' south, longitude 

 170°-171° west. 



Length, one-twelfth of an inch. Colour, deep blue, sometimes a 

 little pearly white along the back. This species has the antennae 

 more divergent than the preceding, and the long caudal stylets are 

 divaricate. The male is not quite as stout as the female. The setae 

 towards the base of the antennae are two or three diameters of the 

 joints in length, and are somewhat curved. The smaller branch of 

 the posterior antennae is about as long as the longer, exclusive of the 

 last joint. The pigment of the inferior eyes forms a rounded spot, 

 slightly transverse, posterior to the superior eyes. The abdomen is 

 five-jointed in the males, diminishing gradually from the first. The 

 female abdomen has but three segments, the second large ovate, occupy- 

 ing more than half its whole length; the apical is short. In one 

 female there was a recurved process on the right side. The stylets 

 are about half as long as the abdomen, or a little exceed half in 

 females. The longest of the caudal setae is about as long as the abdo- 

 men and stylets. 



Mandibles and maxillae as in the figures. 



The male right antenna has no eiliation en the posterior side along 

 the basal half, like the left antenna. The second joint is also much 

 longer ; the fourth and fifth together form properly a single joint, the 

 fourth being short, except that it is prolonged below the fifth ; the 

 fifth has two or three long setae at apex, directed outward in the line 

 of the antennae. The last three joints are like those of the left 

 antenna, but are together somewhat arcuated. 



The right posterior foot has the third joint oblong and articulated 



