60 DR. H. J. HANSEN ON CRUSTACEANS [Jan. 20, 
and the western part of the Pacific, and all these were taken 
near the surface; the ‘Challenger’ specimens taken near the 
surface and referred by Bate to S. atlanticus really belong to that 
species, but his specimens secured at the deep-sea stations 320, 
159, 232, and 173 belong to three other species.—I have found it 
unnecessary to attempt to point out what parts of Bate’s long 
description (and which of his drawings) can be applied to S. atlan- 
ticus; the zoologist is referred to the good description of Kroyer 
together with the additional notes in my earlier paper. 
SERG. SIMILIS, n. sp. (Plate XI. figs. 6 a6 d.) 
The type of this species is the above-mentioned specimen on 
which Bate writes (p. 320): “Stat. 232,... lat. 35° 11’ N., long. 
139° 28’ K., off Japan; depth 345 fathoms... . Length 50 mm.” 
The species is closely related to S. arcticus Kr. The rostrum 
(fig. 6 5) is nearly oblong-triangular, a good deal longer than in S. 
arcticus (Pl. XII. fig. 1 6) and directed more upwards ; the anterior 
margin of the scutum below the rostrum is strongly convex (fig. 6a) 
and protruding, while it is nearly vertical in S. arcticus (Pl. XII. 
fig. 1a). The supra-ocular and hepatic spines are well developed ; 
the gastro-hepatic groove distinct. The eyes are nearly as in 
S. arcticus, large, broader than deep, scarcely as long as broad 
(fig. 6c), decidedly shorter than the outer margin of the distal 
joint of the stalk, and one-half shorter than its inner margin. 
The antenn. ped. (fig. 6c) is about as in S. arcticus; the outer 
margin of the basal joint is as long as the same margin of the two 
distal joints together ; the second joint is rather slender, its inner 
margin almost four times longer than its breadth and scarcely 
longer than the third joint, which is slender, about six times 
longer than broad. The squama of the antenna is moderately broad 
at the end, with the outer spine projecting beyond the terminal 
margin. Of the long appendages, mxp.’, trl.*, and trl.’ are wanting, 
and the remaining thoracic legs are about as in S. arcticus. The 
branchie above trl.’ and trl.* (fig. 6d) present excellent differences 
from those in S. arcticus (Pl. XII. fig. 1c); br.* above trl.’ is not 
quite half as long as br. above trl.*, and in spite of this not incon- 
siderable length it is semi-rudimentary, having only some posterior 
branches, nearly all short, and no anterior branches. Of the 
branchiz above trl.’, br. is long, four-fifths as long as br. above 
trl.?; 6r.1 is more than half as long as br., very well developed, at 
least as long and more than twice as broad as br." above trl.’ 
[In S. arcticus (Pl. XII. fig. 1 c)—from a specimen obtained in the 
most northern part of the Atlantic—br.’ above trl.* is about three- 
fourths as long as br. above trl.*, with well-developed branches 
on both sides; of the branchie above trl.*, br. is only a little more 
than half as long as hr. above trl.*, while 6r.! is small, considerably 
narrower and shorter than br.’ above trl.°] The ext. br. of urp. 
has the apical portion broken off, but it is narrow, and seems to 
have been a little more than five times longer than broad, thus 
slightly narrower than in S. arcticus, but otherwise of the same 
aig SE Se es ST SD a PS 
