HANSEN : THE ISOPODA. 107 



Antennuke. They reach considerably beyond the peduncle of the antennae, 

 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 loug 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. 



Antennce. 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 long (Plate 

 III. Fig. 1) ; their fourth joint scarcely 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. 1 a) ; the fourth joint a little shorter, or at 

 all events not longer, than the fifth. 



Abdoraen. The first segment almost covered, and very conspicuously broader 

 than the fourth. The last segment (Fig. 5 b) about 1|- 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. 5 b). 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 j^ellowish 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. 



Bemarks. The species is easily distinguished by the following characters 

 together : the long distance between the eyes, the long antennae, and the 

 relative length of the rami of the uropods. 



