538 AKE NORDENSTAM 
Upper lip triangular with acute apex. 
Mandibles typical of the genus. First joint of the palp about */s, 3rd 
joint about */, of the length of the 2nd. The relation between the joints is 
Regal: « USt joint almost without setae. 2nd joint with 3 setae in a longt- 
tudinal row on the distal half of the joint. 
Maxillipeds normal, with a little tip at the apex, not distinct as a joint. 
rst pereiopods (fig. 6 a). The 2nd joint a little longer than the 3rd, 4th joint 
about sublunate, the 5th triangular; 6th joint narrowly oval, anteriorly decreasing 
in width. The lower proximal angle close to the carpus is tooth-like and 
pointed. From this tooth a faint carina extends near the anterior edge. The 
anterior edge is convex, the posterior edge slightly concave (almost straight). 
2nd and 3rd peretopods (fig. 6b). Propodus with about 1o short and 
strong and some long and slender setae on the lower margin. 
jth—7th peretopods. Merus with its upper distal corner produced and 
acute and furnished with a seta at the apex. Carpus with distal margin almost 
rounded, only with the upper distal corner very slightly angular, but not produced. 
In the 6th pereiopod (fig. 6c) the carpus has 6 strong setae and some 
slender ones on the lower margin, and the propodus has 4 setae on the lower 
margin. The 5th and 7th pereiopods are also about like as the 6th in this respect. 
rst pleopod (fig. 6d). Basipod with the medio-distal corner produced, 
rounded. Exopod single-jointed, but a very faint limit seems to be slightly 
indicated at the median side. Distal end broadly rounded. 
2nd pleopod (fig. 6e). Exopod two-jointed. First and second joints 
are of about equal length. Endopod with a very faint limit. 
3rd—sth pleopods. Both rami faintly two-jointed, lateral margins with a 
faint incision between the joints, distal margin of 2nd joints with setae. 
Uropods (fig. 6f). The endopod reaches about as far as to the end of 
the telson. First joint with a row of setae on the lateral margin; second 
joint oval, a little longer than it is broad; dorsally it is concave, ventrally con- 
vex. Exopod with its outer lateral margin sinuated near apex. 
Paranthura nana n. sp. — Pl. 20, fig. 6; text figs. 7, 8. 
One female, with empty marsupium, length 4,5 mm. 
Loc. Juan Fernandez, Masatierra, 30—40 m, calcareous algae. 
Description. 
Head rectangular, seen from above slightly longer than wide (a little 
longer than shown in Pl. 20, fig. 6). The anterio-lateral corners rounded, very 
slightly more produced anteriorly than the small triangulate rostrum. Anterior 
margin bisinuated. Eyes small rounded, dark brown, composed of 6—8 ocelli. 
Thorax. Ist segment a little longer than the other, 2nd—4th segments of 
about equal length, 5th is a little longer; 6th and 7th segments decrease in 
length. The 7th segment is about as long as the abdomen without the telson. 
Ventral side on the first thoracic segment strongly carinated; on the 2nd 
the keel is more flattened, the 3rd and 4th segments are ventrally vaulted. 
Impressed line on the last 3 thoracic segments obscure. 
