176 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
and about equal in length. The first of these exopod segments has 
a single acuminate spine at its distal end that is as long as the terminal 
segment. The latter is tipped with three acuminate spines, the inner 
one longer and slenderer than the others. Total length 1.90 to 2 mm. 
Metasome 1.50 mm. long, 0.50 mm. wide. 
Male.—Metasome similar to that of the female, but the forehead 
is smoothly rounded and the spines at the posterior corners are asym- 
metrical, the right one wider and longer than the left and distinctly 
notched on its inner margin. Urosome two-fifths as long as meta- 
some and 5-segmented, the anal segment very short and narrower than 
the others, which are all about the same width, one-fifth as wide as 
the metasome. 
The first antennae reach the center of the third segment of the uro- 
some; the right antenna is geniculate, the terminal portion made up 
of four segments of about equal length. The segment in front of 
the flexure is the same length as the terminal segments but consider- 
ably wider. The second antennae, mouth parts, and first four pairs 
of legs are like those of the female. Each fifth leg is 4-segmented as 
in the female; the second segment of the right leg is invaginated at 
its distal end where it articulates with the third segment. The latter 
is considerably swollen and carries on its outer margin the acuminate 
thumb of the chela. The curved terminal segment forms the dactylus 
and is somewhat flattened, with two setae on its inner surface and 
three at its tip. The third segment of the left leg has a stout spine 
at its outer distal corner and the end segment carries three terminal 
setae three times as long as the segment and an inner fourth one only 
half as long as the segment. Total length 1.82 mm. 
Types.—U.5.N.M. No. 70742; off the Fiji Islands, south of the Suva 
Light. 
Remarks.—The structure of the fifth legs in both sexes and the 
asymmetry of the spines at the posterior corners of the metasome in 
the male are the distinctive characters of this new species. 
CALANOPIA THOMPSONI A. Scott 
PLATE 20, FigurE 282 
Calanopia thompsoni A. Scort, Copepoda of the Siboga Expedition, monogr. 29a, 
pt. 1, p. 178, pl. 69, figs. 1-8, 1909. 
Stations 5105; 5186; 5223; 5342. Originally established by Scott 
upon 160 specimens including both sexes from four Siboga stations 
in the tropical Pacific, but not found in any of the other lists. This 
is the largest species of the genus and is readily distinguished from 
any of the others by its size and by the lateral hooks on the sides of 
the head like those in the genus Pontella. The Albatross specimens 
