346 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Station 5287. Established by Giesbrecht upon female specimens | 
from the straits of Formosa; the male was afterward added by Sewell 
(1914, p. 249). The species is declared by A. Scott in the Siboga 
plankton (p. 190) to be distinct from gracilis, with which it has been 
made synonymous by some writers. The Albatross specimens support 
Scott’s decision. In the female the right leg is almost twice as long 
as the left, while in the male the two fifth legs are of equal length. 
TORTANUS GRACILIS (Brady) 
Oorynura gracilis Brapy, Voyage of H. M. 8S. Challenger, Zool., vol. 8, pt. 28, 
Copepoda, p. 71, pl. 8, figs. 1-14, 1883. 
Stations 5102; 5129; 5175; 5176; 5246; 5340; 5410; 5411; Gilbert 
Islands. Brady obtained specimens of both sexes from the Philippine 
Islands and made them a new species of the genus Corynura. This 
genus name being preoccupied, Giesbrecht (1898, p. 157) substituted 
Scott’s decision. In the female the right leg is almost twice as long 
as the left, while in the male the two fifth legs are of equal length. 
TORTANUS MURRAYI A. Scott 
PLATE 18, FiacurEsS 235-242 
Tortanus murrayi A. Scort, Copepoda of the Siboga-Expedition, monogr. 29a, pt. 
1, p. 191, pl. 56, figs. 1-8, 1909. 
Stations 5129; 5175; 5176; 5246; 5301; 5340; 5410; 5411; Lloilo 
Straits, Philippine Islands; Gilbert Islands. Sars identified speci- 
mens obtained in a surface tow at Butaritari Lagoon as a new species 
and made pencil drawings of all the appendages. They prove, how- 
ever, to belong to the above species described by Scott in his Szboga 
report, but Sars’ figures include details omitted by Scott and for this 
reason are here included and the species redescribed. 
Female.—Metasome elliptical, two and a half times as long as wide; 
head separated from the first segment and narrowed considerably in 
front. Fourth and fifth segments fused with smoothly rounded cor- 
ners and without spines or processes. Urosome nearly symmetrical, 
but the genital segment has a small tubercle at the left posterior corner 
and the left caudal ramus is enlarged a little. 
The first antennae extend beyond the caudal rami and have three 
or four large setae at their tips. The exopod of the second antenna 
is shorter than the endopod, and the second segment is three-fifths 
of the entire length. The three terminal segments carry setae that 
are longer than the entire exopod. The disal segment of the endopod is 
three-fifths as long as the proximal segment and not lobed at the tip. 
The outer tooth on the chewing blade of the mandible is enlarged, 
