22 Mr. I. C. Thompson on the Copepoda 
Outer branch of posterior antennee (fig. 3) about 14 times as 
long as the inner branch. Mandible (fig. 4) consists of a 
large powerful rounded claw, bearing a spine on the outer 
edge. One of the two branches bears a long 2-jointed 
plumose spine, and, like the other branch, several long 
slender spines. Anterior foot-jaw bears five branches, the 
first having on the outer side nine or ten crook-shaped hairs ; 
the others have two to six long apical spines. Posterior 
foot-jaw (fig. 6) 4-jointed ; the second joint on outer side 
fringed with numerous short spines; the fourth joint has 
several apical long spines, two of them having lateral teeth on 
one side. Outer branch of first to fourth pair of swimming- 
feet 3-joimted, the inner branch of first pair 1-jomted, that 
of the second pair (fig. 7) 2-joimted, and of the third and 
fourth 3-jointed. A peculiarity of the second, third, and 
fourth pairs consists in their having a partial second row of 
tooth-lke serrations (fig. 8) on the terminal spines. 
The only two specimens found were immature males, the 
fifth pair of feet of one of them being represented (fig. 9). 
Each of the two branches is composed of four jomts; they 
are, however, asymmetrical, all the jomts of one, with the 
exception of the ultimates, being considerably larger than” 
the corresponding ones of the other branch. The terminal 
joints of each have three apical spines, the central the 
largest, and one mner lateral spine. The two specimens 
were found at 1070 and 1190 fathoms. I have named the 
species S. chelifer, on account of the remarkable claw on 
the mandibles: the name must not be confounded with 
Giesbrecht’s S. chelipes. 
Xanthocalanus Giesbrechti, sp.nu. (Pl. IV. figs. 1-9.) 
Female——Length 34 millim. Body lengthened ovate. 
Rostrum absent. Cephalothorax (fig. 1) 5-jointed. Anterior 
antenne (fig. 2) 25-jointed, the proportional lengths of the 
joints being about as follows :— 
1234567 8 9101112131415 16 17 18 19 20 21 22 23 924 95 
711646551067 8 9 9 111011101058 Sez RomiOlsaee 
Outer branch of the posterior antenne (fig. 3) about 14 times 
as long as the inner branch. Mandible (fig. 4) 2-branched ; 
basal segment has three long bristles on upperside; biting 
portion with long narrow palp. Maxilla very setose (fig. 5). 
Anterior foot-jaw (fig. 6) 5-branched, each terminating with 
seyeral long plumed sete. Posterior foot-jaw (fig, 7) 
