536 AKE NORDENSTAM 
rst pleopod (fig. 5 e). Basipod subrectangular, with the inner distal angle 
not produced. Exopod 2-jointed with the end narrowly rounded. 
2nd pleopod (fig. 5 f). Endopod 2-jointed, 2nd joint about ?/, as long as 
the first. Exopod obscurely 2-jointed. 
3rd—sth pleopods. Like the second. 
Uropods (fig. 5 g). st joint of endopod with a longitudinal row of setae 
on the lateral margin, 2nd joint a little ovate, but only slightly longer than it 
is broad, reaching slightly further than telson, dorsally concave, ventrally con- 
vex. Exopod with outer margin a little sinous near apex. 
Paranthura gracilipes n. sp. — Pl. 20, fig. 5; text fig. 6. 
One female with empty marsupium, length about 9 mm. 
Loc. Juan Fernandez, Masatierra, 30—40 m, sand with calcareous algae. 
Desorption: 
Hlead about */, longer than it is wide. The anterio-lateral corners rounded, 
scarcely more produced than the small triangulate rostrum. Anterior margin 
bisinuate. Eyes large rounded, dark brown, composed of about 22 ocelli. 
Thorax. Vhe thoracic segments decrease very slightly in length to the 6th. 
The 7th segment is abruptly shorter and a little shorter than half the length 
of the 6th. Impressed line anteriorly on the last 3 thoracic segments absent. 
The marsupium consists of 4 pairs of large and thin oostegits and covers 
the 2nd, 3rd, 4th, and 5th segments, and the greater part of the 6th segment. 
The ventral side of first segment is slightly carinated, on the 7th slightly vaulted; 
the other segments have a longitudinal furrow inside the marsupium. 
Abdomen. The § anterior segments increase slightly in width posteriorly. 
Besides the telson, there are 6 segments visible; the 6th is situated between 
the bases of the uropods but is not as broad as the other. The segments are 
distinctly limited also dorsally. The rst abdominal segment is about twice as 
long as the 2nd. The following 5 segments are of about equal length. The 
6th segment (fig. 6f) has its posterior margin cleft. 
Telson (fig. 6f) sublanceolate, a little narrower at the base, with lateral 
margins slightly convex, distally narrowly rounded but with the small setiferous 
apex truncate. Dorsal side somewhat convex, ventral side slightly convex 
with a faint and narrow longitudinal carina in the middle line. 
Colour faintly yellow, with scattered, dark, rounded dots. 
Antennulae are about as long as the head and reach to about half the 
length of the Ist joint of the flagellum of the antennae. First joint about 
twice as long as it is broad and about as long as the 2nd and 3rd joints 
together; 2nd joint slightly shorter than 3rd. -The flagellum is about as long 
as the peduncle (slightly shorter) and consists of 4—6 joints (5 or 6 on the 
right, only 4 on the left antennula). The joints decrease in size from the first 
to the last. 
Antennae. ist joint about half as long as it is broad and about 2/, as long 
and narrower than the 2nd. Second joint with the median margin straight, 
