616 ox CRUSTACEA BROUGHT BV DR WILLEY FROM THE SOUTH SEAS. 



the last mentioned specimen of L. mimita than it is as observed in one of the 

 specimens of L. forresti, but this may be set to the account of individual variation. 



Length, 25 mm. 



Habitat. Sandal Bay, Lifu, Loyalty Islands. 



It is probable that Paratanais erythraea, Kossmann, 1880 (Zool. Ergebnisse Reise 

 Rothen Meeres, Malacostraca. p. 103, pi. 7, fig. 1 — 4), is identical with this species. 



Leptocheli.\ lifuexsis n. sp. ^ 

 . Plate LXV B. 



</. The first two (free) segments of the peraeon are rather shorter than those 

 which follow. The pleon is a little wider than the peraeon, its last segment bluntly 

 pointed as usual. 



Fhst antennae. First joint twice as long as second, which is twice as long as the 

 third ; flagellum of six joints, each nearly as long as the third joint of the peduncle, with 

 perhaps a microscopic seventh joint. 



Second antennae shorter than the peduncle of the first, very slender, all the joints 

 of the peduncle except the last short, the flagellum consisting of one long joint 

 between two that are quite minute ; the terminal setae long. 



Mouth-organs. The upper lip appears to be a narrow plate as shown in the figure. 

 The oral parts opposed to it showed a group of lobes so small and closely compacted 

 that I do not venture to discuss their homologies, and in the figure represent what 

 I saw, perhaps not what I ought to have seen. 



First (/natkojMds. These are elongate, but much more substantial than in Lepto- 

 chelia mimita. The sixth joint or hand can fold back partially into the channelled 

 margin of the large preceding joint ; its long curved thumb has two strong processes 

 of the inner margin, separated by a wide interval, and this leaves a large cavity when 

 the tip of the thumb crosses the tip of the equally long finger; the distal process 

 of the thumb is lower than the proximal and carries some long setae ; the concave 

 margin of the finger is seiTate, and armed with ten spinules. 



The second gnathopods are of the usual slender form, with the finger nearly as 

 long as the preceding joint. 



The first and second peraeopods resemble nearly the second gnathopods, except 

 that the finger is much shorter than the preceding joint. The three following pairs 

 differ by having the second joint stouter, with the sides slightly convex, the fourth 

 joint not end to end with the fifth, but somewhat under-riding it, the fifth with a 

 strong spine at the hind apex, accompanied by other smaller spines, and the sixth 

 with a set of apical spines behind the small curved finger, these in the fifth peraeopods 

 forming a close fringe of about half a score. 



The pleopods appear to have the plumose armature usual in this genus. 



The uropods have a peduncle longer than broad, the outer ramus two-jointed. 



