1903. | IN THE ‘ CHALLENGER’ COLLECTION, 57 
rostrum is rather long, directed forwards and _ considerably 
upwards; its terminal portion is produced into a spiniform 
process, and the upper margin of the rostrum has at the base of 
that process a sharp angle as a rudiment of a spine; the lower 
margin of the rostrum between its base and the apical spine is 
strongly convex, the upper margin nearly straight. Supra-ocular 
and hepatic spines are wanting, the gastro-hepatic groove slightly 
developed. The eyes are large, considerably depressed ; seen from 
the side (fig. 4.@), they are somewhat longer than the whole stalk ; 
seen from above, their basal margin is very oblique (fig. 4 6), so 
that the interior margin of the distal joint of the stalk is as long 
as the outer margin of the eyes. The antenn. ped. with the outer 
margin of the first joint is a little longer than that of the two other 
joints together, and only a little shorter than their inner margin ; 
the second joint with the inner margin is three times longer than 
the breadth, and somewhat longer than the third joint, which is 
about two and a half times longer than broad. The antennal 
squama reaches nearly to the end of the antenn. ped., with its 
distal portion broad and the outer spine well developed. Mxp.° is 
a little shorter than trl.* The branchiz present a transition-form 
between those of S. arcticus Kr. (Pl. XII. fig. 1 c) and S. robustus 
Smith; the pleurobranchial lamella above mxp.* is very small. 
Of the branchie above trl.’ , br.’ is scarcely two-thirds as long as 
br.; of those belonging to “Viel ay OTS iS slightly longer than 67." 
and br. a little shorter than br.’ above trl.’ The ext. br. of urp. 
is almost five times longer than broad, and the hairy portion of its 
outer margin is a little more than one-fourth of the total length.— 
Length 36°5 mm. 
This species occupies an intermediate position between S. arcticus 
Kr. and S. robustus Smith. Bate’s fig. 4, showing an antennule 
and an eye, is misleading, the antennular peduncle being too 
slender, with the basal joint too short, the third joint too long. 
SERG. JAPONICUS Bate, p. 387, pl. lxx. figs. 1, 2. 
Bate enumerates three specimens from two localities: Stat. 232, 
lat. 35° 11' N., long. 139° 28' E., 345 fathoms; and Stat. 207, 
lat. 12° 21' N., long. 122° 15’ E., 700 fathoms. All have been 
preserved, and belong to one species. In 1896 I wrote that 
S. japonicus Bate must be identical with S. mollis Smith (taken 
in the Atlantic, off the United States), and gave reasons for 
my view. On comparing Bate’s specimens with Smith’s elaborate 
description (Rep. U.S. Comm. Fish & Fisher. for 1882, p. 419, 
1884) and his figures (Rep. U.S. Comm. Fish &c. for 1885, pl. xx. 
figs. 3-5), I arrived at the same result. It should be especially 
mentioned that an examination of the branchiz showed the most 
complete agreement with Smith’s description and drawing. For 
full information on S. japonicus Bate, I refer, therefore, zoologists 
to the papers of Smith. 
As already mentioned, I found in the bottle with S. japonicus 
from Stat. 232 a tube containing a smaller animal determined 
