HANSEN: THE ISOPODA. 107 
Antennule. They reach considerably beyond the peduncle of the antenne,, 
and almost to the postero-lateral angle of the first thoracic segment, The pe- 
duncle a little shorter than the flagellum; its basal joint about as long as broad, 
with the antero-interior angle broadly rounded, the third joint scarcely shorter 
than the two proximal joints together. The flagellum with about fifteen 
joints. 
Antenne, They are unusually long, reaching to the middle of the fifth 
thoracic segment. The flagellum more than twice as long as the peduncle, with 
twenty-two joints. 
Thorax. The postero-lateral angle of the first segment and of the epimera of 
all the other segments acute and more or less acute-angled (Fig. 5 a). 
Thoracic Legs. The three anterior pairs are slender and rather lorig (Plate 
III. Fig. 1); their fourth joint searcely incrassated, with concave inner mar- 
gin, and in the second and third pairs with a couple of spines at the distal 
inner angle; the sixth joint rather long.and without spines ; the claw rather 
long, but scarcely longer than the sixth joint. The four posterior pairs rather 
long and slender (Plate III. Fig. 1a); the fourth joint a little shorter, or at. 
all events not longer, than the fifth. 
Abdomen. The first segment almost covered, and very conspicuously broader 
than the fourth. The last segment (Fig. 55) about 14 times broader than 
long ; the apex acute but very little produced ; the posterior margin on each 
side of the apex with four or five comparatively coarse serratures, and a con- 
spicuous spine in each incision ; the dorsal surface very flatly convex, with a 
transverse depression near the base and the median keel not discernible. 
Uropods (Fig. 5b). They reach far beyond the apex of the abdomen, the 
inner ramus scarcely attaining the end of the outer one. The inner ramus is 
relatively broad, but yet more than twice as long as broad, triangular, the 
triangle being almost isosceles, with rounded vertex, as the posterior margin 
is almost as long as the antero-interior one ; the exterior margin almost straight, 
with about five coarse serratures in the distal half, and the posterior margin is 
also serrated; the apex is acute. The outer ramus much narrower than the 
inner one, about four times longer than broad; the apex much produced, 
acute. 
Color. The dorsal surface is yellowish white, the eyes black. 
Size. The single specimen is 14.5 mm. long and 7.5 mm. broad. 
Habitat, Station 3402 (Lat. 0° 57’ 30” S., Long. 89° 3! 30” W.), 421 
fathoms, 1 specimen, 
Remarks. The species is easily distinguished by the following characters 
together: the long distance between the eyes, the long antenne, and the 
relative length of the rami of the uropods. 
