286 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Genus PHYLLOPUS Brady, 1883 
PHYLLOPUS AEQUALIS Sars 
PLATE 27, Figures 394-396 
Phyllopus acqualis Sars, Bull. Inst. Océanogr. Monaco, No. 3877, p. 20, 1920; Rés. 
camp. sci. Albert de Monaco, No. 69, p. 344, pl. 124, figs. 7-9, 1925. 
Stations 5185; 5487. Established by Sars upon a single female 
taken in the Monaco plankton west of Gibraltar. Up to the present 
time no second specimen had appeared, and so the species is not found 
in any of the lists. Both sexes were captured at these Albatross 
stations and the male is here described for the first time. 
Female.—The chief characteristics of the female are the wide and 
somewhat flattened frontal margin between the bases of the first an- 
tennae; the very short and perfectly symmetrical posterior corners of 
the metasome; the perfect symmetry of the genital segment, which is 
fully as wide as long, with convex lateral margins; and the shortness 
of the first antennae, which scarcely reach the anterior margin of the 
fourth segment. The segments of the fifth legs are comparatively 
elongate and narrow, and the setae on the first and third segments 
are exceptionally long. Total length 8mm. Metasome 2.35 mm. long, 
1 mm. wide. 
Male.—Metasome elliptical, not narrowed so much posteriorly as 
in the female, the posterior corners slightly longer and symmetrical. 
Urosome 5-segmented, all the segments approximately the same length 
and width, the anal segment reentrant posteriorly. Caudal rami 
nearly twice as long as wide and divergent; each with five setae, the 
outer one near the center of the lateral margin, the second inner one 
thicker and much longer than the others. 
The left antenna is geniculate, the terminal portion made up of 
three segments, which together with the five segments in front of the 
flexure are elongate, narrow, and somewhat flattened. None of them 
are armed with setae except the two at the tip of the terminal portion. 
The rest of the antenna is gradually widened toward the base, and 
the segments are very short and indistinct with two or three long 
setae and numerous short ones. The fifth legs are shown in figure 395 
and are considerably different from those in other species. The 
endopod of the left foot is quite small and only subtriangular in 
shape. The proximal segment of the exopod has a long process at 
the outer distal corner tipped with a spine. The terminal segment 
is stout and elongate with a short terminal spine and a longer sub- 
terminal one, curved like a sickle. The right basipod carries the rudi- 
ment of an endopod and a 2-segmented exopod, whose end segment 
is considerably flattened and somewhat cochleate. Total length 2.90 
mm. Metasome 2mm. long, 1 mm. wide. 
