HANSEN : THE ISOPODA. 103 



Thorax (Fig. 2 a). The posterior angle of the first segment rectangular, 

 scarcely produced. For practical reasons, the "epimera" of the six following 

 segments, though in reality constituting the first joint of the legs, are here 

 treated as belonging to the thorax ; the epimera of the second thoracic segment 

 with the posterior free angle nearly rectangular, those of the third segment 

 somewhat obtuse-angular. The epimera of the four posterior segments poste- 

 riorly consideral)ly produced ; those of the fourth and fifth segments poste- 

 riorly obliquely rounded ; the last two pairs with the triangular apex a little 

 rounded. 



Tlioracic Legs. All clumsy. In the three anterior pairs the fourth joint (the 

 «pimeron considered as the first joint) is shorter than the third, considerably 

 incrassated, in the first pair with only one spine, in the second with six or seven 

 (Fig. 2 h), in the third with nine short spines at the interior margin ; the fifth 

 joint only in the third pair with a spine at the antero-interior angle ; the sixth 

 joint short, without keel on the inner side; the claw (consisting of the seventh 

 joint fused with the real claw) short and robust. The four posterior pairs (Fig. 

 2 c) with numerous, comparatively short spines. 



Abdomen. The first segment partly free, a little broader than the fourth. 

 The sixth segment about 1| times broader than long ; the dorsal surface feebly 

 convex, very slightly keeled in the median line, and between this keel and the 

 base of the uropod is seen a large, but shallow depression; as the posterior 

 apex unfortunately is broken off, nothing can be said about its shape, but most 

 likely it was acute, and the posterior margin probably with about five spines 

 on each side. 



Urojjods. They reach a little beyond the end of the abdomen ; both rami are 

 proportionally narrow, of the same breadth and the same length, the inner ra- 

 mus therefore posteriorly surpassing the outer one. The inner ramus more than 

 three times longer than broad ; the interior margin from a point a little behind 

 the apex of the very long and narrow process from the peduncle turning ob- 

 liquely outward, thus forming a posterior margin, with five or six small spines ; 

 the exterior margin somewhat convex, but at a short distance from the rounded 

 tip of the branch it changes its direction, bending somewhat outward, thus 

 forming a low incision. The outer ramus with the tip rounded ; the distal part 

 of both margins faintly serrated with a smaller number of spines. 



Color. The whole dorsal surface yellowish white, the eyes grayish. 



Size. The single specimen measures 55 mm. in length and 26 mm. in 

 breadth. 



Habitat. Station 3362 (Lat. 5° 56' N., Long. 85° 10' 30" W.), 1175 fathoms, 

 1 specimen. 



Remarks. The species is closely allied to ^. psora (L.), but is easily distin- 

 guished by its enormous size, and the following characters : a difierent shape of 

 the frontal plate ; the eyes smaller and more distant from each other ; the 

 dorsal surface of the last abdominal segment slightly convex, with two large 

 depressions. 



