104 



Of the carinas of the carapace the 1st, or postocular, and the 3rd or " post- 

 antennal " are very distinct, the former reaching nearly to the posterior border, 

 the latter being lost on the after part of the branchial region. The 2nd or 

 " post-antennnlar " carina is a mere buttress to the orbital spine, with which it 

 is continuous. 



The branchiostegal spine, which is continuous with the post-antennal carina, 

 does not project as far as the orbital spine. 



The abdomen is smooth, except for a very broad blunt median carination 

 of the 3rd tei'gum, the posterior border of which tergum is little convex. The 

 6th tergum is not very much longer than the 5th ; and the telson, which is as 

 long as both combined, is equal in length to the caudal swimmerets. 



The antennular peduncle reaches nearly to the anterior third of the antennal 

 scale, its first joint is much the longest : the very acute antennular scale reaches 

 nearly to the end of the 2nd joint, and has a little secondary lobule at the base 

 of its outer margin. The antennular flagella are longer than the combined 

 carapace and rostrum. 



The antennal scale is about half the length of the carapace proper, its 

 greatest breadth is about two-fifths its length : the midrib is very strong and 

 the outer border is broadly thickened, trenchant, and ends acutely. At the far 

 end of the outer border of the 2nd joint of the antennal peduncle is a spine. 



The external maxillipeds are longer and very much stouter than the 1st 

 pair of legs ; they reach beyond the antennal scale by half their terminal joint, 

 which is clorsally spinose : their exopodite is small. 



As Caiman has noticed, the 1st pair of legs — which just, or barely, reach 

 the tip of the antennal scale, — end in a very imperfect subchela of such minute 

 size as to be recognizable only under the microscope. 



The legs of the 2nd pair are very unequal in length and a little unequal in 

 thickness. The leg on one side is as stout as any of the posterior legs and ends 

 in a chela of some size, but does not reach further than the end of the antennu- 

 lar peduncle : its fellow on the other side is slenderer than the posterior legs, 

 ends in the usual small chela, and reaches beyond the tip of the antennal scale 

 by a third of its long carpus. 



The last three pairs of legs are very nearly of a length, the 5th pair being 

 a little the shortest : the 3rd pair reach beyond the antennal scale by a little 

 more than their two terminal joints : in all of them the posterior border of the 

 merus is spinose and the same border of the next three joints carries some 

 microscopic spinelets, and the dactylus is very short. 



Colour in life pink, legs pink and white. 



In the largest egg-laden female of the collection the length of the rostrum 

 is 32 millim., of the carapace 42 millim., and of the abdomen 82 millim. In the 



