312 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
and 5-segmented, just a fourth as long as the metasome on the mid- 
line and about a fourth as wide. The genital segment is as long as 
the two following segments combined and a trifie wider; the other 
four segments are the same width but vary a little in length. The 
caudal rami are as long as the last two segments combined, subrectan- 
gular in outline, close together, and parallel. 
The first antennae are a little longer than in the female, and the 
enlarged portion of the right or grasping antenna is shown in figure 
501. The most prominent characteristic is the curved points on the 
outer margins of the three distal segments and the stout spine on the 
inner margin of the last one. The second antennae, mouth parts, and 
first four pairs of legs are like those of the female. The fifth legs 
are seen in figure 502, and they present several specific characters. 
The movable finger on the chela of the right leg is spatulate, tipped 
with two spines and armed with three others on the inner margin at 
the base. The thumb is short and stout and squarely truncate at the 
tip, with a small spine at each corner. The left leg is 3-segmented, 
with tufts of hairs on the inner margin at the two joints. The end 
joint is tipped with three spines, the two outer ones acute, the central 
one longer, curved, and blunt. Total length 3.75 mm. Metasome 3.25 
mm. long, 1.2 mm. wide. 
Types —U.S.N.M. No. 74142; station 2937, latitude 33°04’30’’ N., 
longitude 117°42’ W., off southern California. 
Remarks.—The fifth legs of the male are so distinct as to establish 
the validity of the species at once, but the fifth legs of the female are 
almost exact replicas of those of bitumida. However, this female is 
twice the size of the bitwmida female; its first antennae reach only to 
the third segment and its metasome ends in stout acute spines. Fur- 
thermore, its urosome is asymmetrical and its caudal rami are as wide 
as long. 
PONTELLOPSIS STRENUA (Dana) 
PLATE 31, Fiacures 476-480 
Poniella strenua Dawa, Proc. Amer. Acad. Arts and Sci., vol. 2, p. 32, 1849. 
Pontellina strenua Dana, United States Exploring Expedition, 1838-42 (Wilkes), 
vol. 14, pt. 2, Crustacea, p. 1158, 1853; pl. 81, fig. 4 a—d, 1855. 
Stations 27; 3980; 4037; 4619; 4640; 4684; 4695; 5134; 5319; 5340; 
Caldera Bay anchorage, west coast of Mindanao, Philippine Islands. 
Established by Dana upon male specimens from south of the Kingsmill 
Islands in the tropical Pacific and put in the genus Pontellina; trans- 
ferred to the genus Pontella by Brady in the Challenger plankton, and 
to Pontellopsis by Scott in the Siboga plankton, all specimens being 
males. Giesbrecht (1892, p. 496) listed both sexes, but gave only a 
short description and but one detail for the female. A full description 
of both sexes is here given, and, since Dana’s original types have long 
