10 PROCEEDINGS OF THE NATIONAL MUSEUM vol. los 



inner antennular flagelliim about as long as combined lengths of cara- 

 pace and first three abdominal somites; outer flagellum composed of 

 about 17 segments, the first 12 of which are swollen. Antennal scale 

 (fig. 4,gf) about 6% times as long as broad; the outer distal spine falls 

 slightly short of the level of the distal end of the blade. Antennal 

 peduncle reaching about as far as distal end of second anten- 

 nular segment; antennal flagella more than IK times as long as body. 

 Third maxdlipeds (fig. 4,1) exceed antennal scale by slightly more than 

 the two distal segments. Right leg of first pan- (fig. 4,to) chelate and 

 extending beyond the antennal scale by the length of the fingers and 

 about one-half of the hand. Left leg of fiii-st pair (fig. 4,?i) simple, 

 overreaching antennal scale by the length of the dactyl and about 

 three-fourths of the propodus. Exopods of the first legs small, 

 extending little if at all beyond the ischium. Eight leg of second 

 pair (fig. 4,o) reaching beyond antennal scale by the lengths of the 

 chela, carpus, and one-third of the merus; carpus divided into about 

 43 articulations and merus into about 15 less distinct ones. Left 

 leg of second pair (fig. 4:,p) overreaching antennal scale by chela 

 and carpus; carpus composed of about 19 articulations and merus of 

 about 6 indistinct ones. Third leg (fig. 4,g) extending beyond an- 

 tennal scale by dactyl, propodus, and about one-half of carpus; 

 fourth leg (fig. 4,r) by dactyl, propodus, and three-fourths of carpus; 

 and fifth leg (fig. 4,s) by the dactyl and three-fourths of the propodus. 

 The appendix masculina on the second pleopods reaches to the distal 

 fifth of the endopod and bears four long spines on its obliquely truncate 

 end (fig. 4,u). 



The mouthparts are shown in fi.gure 4:,h-k. The first maxilla is 

 apparently so reduced that its proper orientation could not be deter- 

 mined after it was removed. 



The carapace of the holotype measures 2.5 mm. in length, and the 

 entire animal is approximately 10 mm. long from the tip of the 

 rostrum to the end of the telson. The paratype is about 10.5 mm. 

 long and has a carapace length of 2.7 mm. 



This species is apparentl}^ smaller than anj^ of the previously known 

 species of Nikoides. It is distinguished also bj^ its smaller and 

 dift'erently formed rostrum, different proportions of the antennular 

 peduncle, and shorter exopods on the first pau" of legs. The latter 

 character possibly strengthens Gurney's contention (1937, p. 89) that 

 Nikoides is not a valid genus and can only be maintained as a matter 

 of convenience; it seems best, however, to retain its identity for the 

 present at least. 



