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. Nematobrachion sexspinosus H. J. HANSEN, Bull. Mus. Océan. Monaco, no. 210, p. 51. 
Sta. 4699. Dee. 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. jlexipes, 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 JN. 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. 1b and 1c) 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 N. 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 nevertheless reaches a little beyond the outer margin of third joint.— 
The maxillae (fig. 1d) 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 1f), and the median tooth or 
process is conspicuously larger than the sublateral teeth. The lateral plates 
of the five anterior segments with the 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. 1g-1li) are rather similar to those of NV. boopis, 
— 
