1912.] R. B. SEyMouR-SEWELL: Surface-Living Copepoda. 305 
The 5th pair of legs very closely resembles those of P. serri- 
caudatus (Th. and Scott). The outer claw bears an inner toothed 
lamella and is slightly longer than the inner claw. 
o Total length 1°3 mm. 
Cephalo-thorax as in the female. 
The abdomen consists of 5 segments, of which the 2nd, 3rd and 
4th are armed posteriorly with a complete ring of triangular teeth ; 
the relative lengths of the segments and furca are2:5:5:5:3:5- 
The grasping antenna consists of 21 free joints, of which 
the 13th-17th are swollen; the knee joint occurs between the 18th 
and rgth segments. ‘he ‘‘ endabschnitt’’ comprises three seg- 
ments. Sickle-shaped spines are articulated with the anterior 
border of segments 10-13. 
The rst to 4th legs are the same as in the female. 
The 5th pair of legs. On the right side, the 2nd basal segment 
catries on its inner aspect a Y-shaped spinous process, the endo- 
podite. The exopodite is three-jointed; the Ist segment is pro- 
duced externally in a Y-shaped spinous process, and the posterior 
border of the articulation with the 2nd segment is armed with a 
row of teeth. ‘The 2nd segment bears on its outer surface distally 
a short thick spine with serrated margins, and the 3rd segment is 
sickle-shaped and its inner margin is finely denticulate. On the 
left side the endopodite is represented by a fringed unjointed 
process. The exopodite is two-jointed and the 2nd segment 
consists of a thin plate bearing a spine at each corner of the 
distal extremity, the margin between being finely denticulate ; 
the outer border bears a blunt process which projects at a right 
angle. 
It is not improbable that many of the records of the occur- 
rence of P. sevricaudatus in Indian waters really refer to this species. 
Family TEMORIDAE. 
Genus Temora, W. Baird. 
I, Temora discaudata, Giesbrecht. 
Pl. xxii, figs. 8 and 9. 
Occurrence: Localities A, B, D, E, F, G, J, L, M, N, O, P. 
This species was of almost universal distribution ; its maximum 
frequency was obtained in A and B. A considerable degree of 
variation was found to exist in the structure of the 5th pair of legs 
of the female. In the majority of cases the condition was that 
usually described, the inner spine arising close to the end of the 
terminal segment, but in others it arose from the inner border 
some distance from the extremity, at about the junction of the 
middle and distal thirds; in all cases it appeared to retain the same 
relative position to the external margin spine, thus indicating that 
it was the terminal post-spinal portion of the segment that had 
increased in length. 
