8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 105 



Family Processidae 



Nikoides sibogae de Man 



Nikoides sibogae de Man, 1918, p. 160; 1920, p. 193, pi. 16, figs. 50-50J; 1922, p. 46. 



Bikini Atoll; 1946; M. W. Johnson; 1 ovigerous female. 



The single specimen has a carapace length, exclusive of the rostrum, 

 of 4.2 mm. It agrees very well with de Man's description (1920) of 

 the type specimen. The species appears to differ from N. danae 

 Paulson, with v/hich it was synonymized by Gurney (1937, p. 89), in 

 the following particulars: The outer spine of the antennal scale 

 falls far short of the end of the blade, rather than exceeding the blade 

 as noted by Nobili (1906, p. 80) and Gurney; the third maxillipeds 

 exceed the antennal scale by nearly or quite all of the two distal 

 segments, not by little more than the terminal segment; the non- 

 chelate first leg surpasses the antennal scale by the dactyl and most 

 of the propodus, rather than by the dactyl alone; and the fourth 

 legs extend beyond the antennal scale by the dactyl, propodus, and 

 nearly all of the carpus, rather than by the dactyl and somewhat 

 more than half of the propodus, as noted by Nobili in A^, danae. 

 Until more is known of the variation in the species, it seems best to 

 retain de Man's name for this form with the longer and more slender 

 appendages. 



Nikoides nanus, new species 



Figure 4 



Eniwetok Atoll: Runit Island; intertidal; May 30, 1949; M. W. 

 Johnson; 1 male holotype (USNM 94741). 



Bikini Atoll: Namu Island; reef at shore inside lagoon; Apr. 3, 

 1946; M. W. Johnson; 1 male paratype. 



Carapace armed with a prominent antennal spine extending well 

 beyond the anterior margin; lower anterior angle of carapace rounded 

 and armed with a marginal row of eight or ten long, slender spinules. 

 Rostrum (fig. 4,6) small, reaching barely as far as the proximal ends 

 of the eyestalks, and provided with a long, slender spinule on each 

 side; these spinules seem to be set in a notch in the upper margin of 

 the rostrum, but no true rostral tooth is apparent. Abdomen mostly 

 smooth and bare on the first fom- somites, covered with an increasing 

 number of slender spinules on the fifth and sixth somites and the 

 telson, as well as on the inner uropods; sixth somite a little more 

 than twice as long as fifth; pleura of both fifth and sixth somites 

 armed with a sharp posterior tooth (fig. 4,c). Telson more than 

 IK times as long as sixth somite, armed with two pairs of dorsal and 

 three pairs of distal spines, in addition to the numerous spinules 

 covering the surface (fig. 4,cZ-e), 



