288 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
ments equal in Jength; anal segment slightly longer and widened 
distally. Caudal rami twice as long as wide and parallel, each with 
five setae, the outer one at the center of the outer margin. 
First antennae as long as the metasome, the right one very slender, 
the left one stouter and geniculate, the terminal portion 3-segmented. 
Second antennae, mouth parts, and first four pairs of legs like those of 
the female, fifth legs distinctive. The left basipod carries a triangular 
endopod attached by its apex, the other two angles rounded. The 
proximal segment of the exopod projects outside the base of the distal 
segment and is tipped with aspine. The end segment is much swollen 
and tipped with a stout spine, and the accessory movable spine is long, 
slender, and nearly straight. The right leg has no endopod, and the 
distal segment of the exopod is flattened into a lamina bent nearly at 
right angles. The part beyond the bend is boot-shaped, as in helgae, 
but carries on the heel a stout process tipped with a minute spine. 
Total length 2.60 mm. Metasome 1.90 mm. long, 0.90 mm. wide. 
Allotype.—U.S.N.M. No. 74129; station 5185, latitude 10°05’45”’ N., 
longitude 122°18’30” E., between Panay and Negros. 
Remarks.—Station 5185, where these A/batross specimens were 
obtained, is between Panay and Negros Islands not far from the Banda 
Sea where Scott’s types were obtained. Referring to the comparison 
of this species with aeqgualis, mentioned under the latter species, we 
have here two females enough alike to make their separation some- 
what difficult and two males exhibiting enough dissimilarity to make 
their separation imperative. Evidently this is an instance where 
both sexes are necessary to make satisfactory specific diagnoses. 
PHYLLOPUS HELGAE Farran 
Phyllopus helgae Farran, Fisheries Ireland, Sci. Invest. for 1906, pt. 2, p. 83, pl. 8, 
figs. 5, 6, 1908. 
Stations 5120; 5820. Farran’s type specimens were obtained in the 
deep Atlantic off the west coast of Ireland. The species was found 
also in the Monaco, Siboga, and Carnegie planktons. 
PHYLLOPUS IMPAR Farran 
Phyllopus impar Farran, Fisheries Ireland, Sci. Invest. for 1906, pt. 2, p. 84, pl. 9, 
figs. 1-4, 1908. 
Stations 4664; 5120. Established by Farran upon female specimens 
from the northern Atlantic, and afterward both sexes were described 
in the Siboga plankton and in the Monaco plankton. The Monaco 
specimens came from the northern Atlantic as did the types, but the 
Stboga specimens came from the Malay Archipelago in the Pacific. 
