NO. 2129. PHILIPPINE CRUSTACEANS— HANSEN: 649 



Description. — Very similar and closely allied to N. microps, but a 

 little more slender. Rostrum in tlie female (fig. 2a) long, moder- 

 ately narrow, at tlie broader base not marked off from the frontal 

 plate; in the male (fig. 26) the rostrum is acute, triangular, short, 

 about reaching the middle of the transverse thickening between the 

 eye-stalks, a little shorter than broad and scarcely or not marked 

 ofi^ from the frontal plate. Carapace in the adult. male with a dis- 

 tinct marginal denticle a little from the posterior end, in the adult 

 female without any denticle. 



Eyes decidedly smaller than in specimens of N. microps of the 

 same size; then- upper section is conspicuously smaller than the 

 lower. Antennular pedimcles m the female as in N. microps, in the 

 male not quite so thick as m this species and its lower flagellum with- 

 out any curved basal portion. Prehensile legs nearly as in N.. 

 gracilis. 



The male copulatory organs of first pleopods (figs. 2c-2f) show 

 peculiar features. The imier lobe^is obliquely rounded, with the 

 result that the spine-shaped process {p^) originates not only con- 

 siderably more proximally than the terminal process {p^), but even 

 more proximally than the proximal process {p^). The spine-shaped 

 process {p^) is long, nearly as long as, or longer than, the proximal 

 process (p^) and from a httle less to a little more than twice as long 

 ^s the terminal process (p^), which is short, somewhat conical. The 

 loximal process is thick at the base and tapers to the subacute or 

 blunt end; it is frequently curved, sometimes nearly straight. The 

 median lobe (Zm) is uncommonly large, not twice as long as broad, 

 mth the outer margin and the somewhat curved terminal margin 

 forming together a long very arcuate line, W"hile the iimer margin 

 is flatly convex and at its end an acute or subacute terminal angle is 

 found; the lateral process (p*), which is very small, is placed near 

 the base of the lobe just opposite the insertion of the proximal 

 process. The auxiUary lobe is somewhat short; the setiferous lobe 

 is moderately broad, reaches distinctly beyond the median lobe,- 

 and has only six setae. 



Length of a large female, 14.5 mm.; of an adult male, 12 mm. 



The type, a male, is Cat. No. 47SS8, U.S.N.M. 



The paratype a female, is Cat. No. 47889, U.S.N.M 



RemarJcs.^-N. lobata is smaller and more slender than N. microps, 



ith somewhat smaller eyes. But the male copulatory organs 

 afford the best cliaraoters; the median lobe differs widely in shape 

 and size from that in N. microps or N. atlantica, the termmal process 

 is considerably shorter than in N. microps; the inner and the median 

 lobes and their processes show several other peculiar featiu-es men- 

 tioned above. All my specimens, several hundi^ed, have a peculir.r . 

 grayish color, but I do not Icnow whether that may be due to the 



