272 THE SCHIZOPODA. 



taken at the surface, but the occurrence there must certainly be rare, as all 

 specimens secured in the Pacific are marked "300 fms. to surface" or, in some 

 instances, the instrument employed had been sunk to greater depths. 



32. Nematobrachion sexspinosus H. J. Hansen. 



Plate 10, fig. 6a; Plate 11, figs, la-li. 



1911. Nematuhrachion sexspinosus H. J. Hansen, Bull. Mus. Oc^an. Mouaco, no. 210, p. 51. 



Sta. 4699. Dec. 25, 1904. Lat. 21° 39.5' S., long. 104° 29.8' W. 300 fms. to surface. 2 adult males. 



Description. — Body somewhat more clumsy than in N. flexipes, otherwise 

 rather similar in general aspect. — Frontal plate nearly as in N. flexipes, produced 

 in a compressed, proximally somewhat deep (fig. la), thin, acute, moderately 

 long rostrum; the dorsal keel about as in the two other species. 



Eyes black, conspicuously larger and especially proportionately longer 

 than in N. flexipes, otherwise as in that species. The antennulae essentially 

 as in the last-named species, excepting that the process at the outer distal angle 

 of second joint (figs, lb and Ic) is shaped as a large, oblong, subtriangular plate 

 with the end acute and a little acuminate. — The antennae with the squama and 

 the distal peduncular joint of the endopod as in A'', flexipes. 



The maxillulae (Plate 10, fig. 6a) have the distal lobe somewhat broader 

 than the proximal and scarcely longer at the upper margin than broad; the palp 

 is very long, considerably longer than the lobe of third joint and moderately 

 slender; a pseudexopod (pex) is present as an oblong-oval, somewhat small 

 plate which ne\-ertheless reaches a little beyond the outer margin of third joint. — 

 The maxillae (fig. Id) with the main part only very little longer than broad; 

 the palp is conspicuously smaller than in the two preceding species, distinctly 

 shorter than the breadth of the lobe from third joint and somewhat less than 

 twice as long as broad. — Second pair of thoracic legs with fifth joint scarcely 

 longer than the sixth. 



The abdominal segments without dorsal spines excepting the fourth and fifth 

 segments, each of which has three sharp teeth projecting from the hind margin 

 at some distance from each other (figs, le and If), and the median tooth or 

 process is conspicuously larger than the sublateral teeth. The lateral plates 

 of the five anterior segments with tlie postero-lateral angle acute and those of 

 fifth segment produced considerably backwards (fig. le). — The uropods as in 

 N. flexipes, but the telson with 6-8 pairs of dorsal saw-like teeth. 



The copulatory organs (figs. Ig-li) are rather similar to those of N. boopis, 



