86 
There are short setee on the convex lower margin. The front 
of the carapace is closely beset with plumose sete, and such 
are found on the rounded postero-inferior margins of the 
first five pleon segments. The long sixth segment is strongly 
compressed, with sete about the minutely produced dorsal 
apex. The narrow, dorsally flattened, laterally sulcate telson 
is closely fringed with plumose sete from the customary 
lateral bulge to the acute apex. The length equals that of 
the unarmoured margin of the outer ramus of the uropods. 
The eyes are rather over half as long as the first joint of the 
upper antennae, the corneal part w:der than half the length, 
dorsally longer but ventrally shorter than its own width. 
The upper antennae have the second and third joints stout, 
the third three-fifths of length of second, which is shorter than 
the first. The characters of the male flagella, as shown in the 
figure, are not exceptional in this species. The peduncle 
measured 10 mm., the long flagellum 54.5 mm. 
The scale of the lower antennae reaches the middle of the 
third joint of the upper. The outer spine projects a little beyond 
the rounded apex, where the scale is less than a third as broad 
as it is near its base. The delicate flagellum attains a length of 
163 mm., a large part of it carrying a pair of finely plumose 
setee at apex of each little squarish joint and a shorter seta a 
little higher up. This graceful apparatus is described by Chun 
in respect of his S. magnificus. 
The mouth-organs agree in general with those which Hansen 
has figured for S. challengert. The mandibles are strong, with 
the paip large and coarsely armoured. In the broad second 
maxillipeds the penultimate joint is here decidedly longer than 
the antepenultimate, which in Hansen’s species it equals in 
length. 
The third maxillipeds and the peraeopods are in near agree- 
ment with those of S. vobustus as described by Professor S. I. 
Smith, except in respect to his statement that the fourth 
peraeopods are very much stouter than the third. Here they 
are not so stout, though their breadth may be a little greater, 
but they are laminar like the fifth pair, and like that pair are 
adorned with very long plumose sete. Here, as in S. 
vobustus, the upper margin of the fifth and sixth joints is setose 
as well as the lower in the fifth pair, but not in the fourth. The 
luminous organs are considerably more numerous in the,third 
pair than in the other peraeopods. 
The petasma on the first pleopods of the male has a general 
resemblance to that of S. vobustus, but a comparison of the 
figures shows differences in detail. It is a paired organ, with 
