946 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
segments combined, nearly three times as long as wide, a little divergent 
and straight rather than curved. 
First antennae reaching the caudal rami, the right one geniculate 
and forming a grasping organ similar to the one found in the males 
of lubbockii and brunescens. The terminal portion beyond the hinge 
is made up of four segments, the two proximal ones each about as 
long as the two terminal ones combined. The proximal one next to 
the ‘hinge has a serrated ridge running along the lateral margin and 
extending beyond the distal end. The segment on the other side of 
the hinge has a spoon-shaped process with a serrated edge, which 
can be swung around parallel to the ridge on the terminal portion, 
the two forming a strong grasping organ. 
The right fifth leg of the male is stoutly developed, the basal segment 
triangular, the second segment ellipsoidal, the chela with a strong 
hand, a curved spoon-shaped finger, and a short curved thumb. The 
left leg is as long as the right and biramose, the exopod 2-segmented, 
the end segment with scattered spines on its surface and a long, slender 
terminal process. The endopod is also 2-segmented, the basal segment 
as wide as the basal segment of the exopod but not so long. The end 
segment is a curved cone covered with coiled corrugations. Total 
length 2.30 to 2.45 mm. 
Types.—U.S.N.M. No. 74120; Caldera Bay anchorage, west coast of 
Mindanao, Philippine Islands. 
Remarks.—At first sight this species bears a close resemblance to 
Czerniavsky’s Labidocera brunescens, but closer examination reveals 
many differences. It is one-half larger and has no asymmetry in the 
fifth segment and its posterior spines or in the urosome, and the 
details of the fifth legs of both sexes, especially those of the female, 
are quite different. The stout and well-developed endopod of the left 
fifth leg of the male is quite uncommon and suggests the specific name. 
LABIDOCERA KRGYERI (Brady) 
Pontella krgyeri Brapy, Voyage of H. M. S. Challenger, Zool., vol. 8, pt. 23, 
Copepoda, p. 93, pl. 39, figs. 1-19, 1883. 
Stations 4588; 4611; 4952; 5128; 5183; 5134; 5228; 5349; 5558; 
Lioilo Straits, Philippine Islands. This species was more widely dis- 
tributed than detruncata in the Siboga plankton, was reported in the 
Challenger plankton, but did not appear at all in the Monaco or 
Carnegie planktons. 
LABIDOCERA LAEVIDENTATA (Brady) 
PLATE 24, FicurRES 351-355 
Pontella laevidentata Brady, Voyage of H. M. 8. Challenger, Zool., vol. 8, pt. 23, 
Copepoda, p. 93, pl. 38, figs. 1-6, 1883. 
