252 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Scott as a new species of Scolecithria from the Gulf of Guinea, this 
species was fully described and figured by Sars in the Monaco plank- 
ton, but it does not appear in the other plankton lists. Both sexes 
were found at the above Albatross station and are the first record 
from the Pacific Ocean. All previous specimens have been females, 
and the male is here described for the first time. 
Female.—As described by Sars. Scott stated that the inner ter- 
minal spine of the fifth leg “is longer than the others and is finely 
serrate on the outer margin.” Sars made no statement with refer- 
ence to this spine, but his figure does not show any serration. These 
Albatross specimens showed no serration, but rather a fringe of short 
plumes. 
Male—Body short and thick-set and quite differently proportioned 
from that of the female. Metasome elongate-oval but comprising 
only 62 percent of the entire length, while in the female it is 83 per- 
cent. The posterior corners are smoothly rounded and slightly over- 
lap the genital segment. The forehead also is evenly rounded with no 
trace of a crest, and neither of the first antennae is geniculate. The 
urosome is only a fourth as wide as the metasome but is considerably 
more than half as long and 4-segmented. The genital segment is not 
quite so long as the first two abdominal segments combined but is a 
little wider. The anal segment is so short as to be easily overlooked 
and appears to be telescoped into the end of the segment in front of it. 
The antennae, mouth parts, and first four pairs of legs are like those 
of the female; the fifth legs are of the same general pattern as those of 
frontalis but differ in detail. The proximal segment of the right 
exopod is much widened where it joins the basipod and carries a 
rounded knob at its distal end on the inner margin. The right 
endopod is distinctly segmented, the two segments about equal in 
length. The left endopod is longer than the exopod, each being 38- 
segmented, and the terminal endopod segment is short and shaped 
much like the blossom of a calla lily. Total length 3mm. Metasome 
1.85 mm. long. 
Allotype male—U.S.N.M. No. 74123; station 5120, latitude 
13°45’30”’ N., long. 120°30’15’’ E., west of Lubang, Philippine Islands. 
Remarks.—The discovery of the male furnishes convincing evi- 
dence that Sars was right in transferring the species from the genus 
Scolecithrix, where it was placed by Scott, to the present genus. The 
fifth legs of the female described by Wolfenden (1911, p. 253) as a 
new species, Scolecithriw acutus, correspond so closely to these of 
latipes that the male must be found before the validity of his species 
can be admitted. 
