COPEPODS GATHERED BY ALBATROSS—-WILSON 169 
of those taken at station 3, all the Albatross specimens were found in 
the Pacific, chiefly south of the Equator. As would naturally be ex- 
pected, these Pacific specimens show regional differences, which, how- 
ever, are more than offset by the numerous points of correspondence, 
leaving no doubt as to their identity. The fifth legs of the males 
are exact replicas of the figure given by Sars in his Monaco report, but 
those of the female are proportionally elongated. One of the females 
at station 5120 showed the malformation appearing on plate 22, 
figure 802, the right leg lacking the two plumose setae at the inner 
distal corner of the proximal segment. The segment itself is also 
rounded off and narrowed enough to show that it never possessed 
those setae, although it does present an exceptionally long appendicu- 
lar seta. 
ARIETELLUS TRIPARTITUS, new species 
PLATE 4, FiguRES 27-29 
Stations 4740; 5301. Four females were found at the first of these 
stations between the Galapagos and Paumotu Islands; a single female 
was found at the second station, in the China Sea. 
Female.—Metasome about two and a half times as long as wide 
and narrowed anteriorly and posteriorly, with smoothly rounded 
posterior corners. The head is fused with the first segment and the 
combined cephalothorax makes up about two-thirds of the metasome. 
A short crest projects from the center of the forehead which shows 
up better in a lateral view (pl. 4, fig. 28), where it is seen to be 
curved downward a little. The second segment is longer than either 
the third or the fused fourth and fifth segments, which are about 
equal in length. The posterior corners are broadly rounded and 
without spines, although they project backward nearly to the posterior 
margin of the genital segment. The urosome is 4-segmented and 
widened posteriorly, the anal segment longer than the other two 
abdominal segments combined and also wider. The caudal rami are 
as long as the anal segment, twice as long as wide and divergent. All 
the caudal setae were so mutilated that no idea of their length or 
of the density of the plumes upon them could be obtained. 
First antennae just reaching the postericr margin of the third 
thoracic segment; endopod of second antenna more than half as long 
again as the exopod. Maxilliped slender, the basal segment not en- 
larged, and armed with setae only; first four pairs of legs like those 
in other species of the same genus. The fifth legs, however, are 
peculiar in that the second segment carries three stout plumose setae 
instead of two at its inner distal corner. The corner is broadly 
rounded, projecting more than in other species; the three setae are 
