556 DR THOMAS SCOTT ON THE 
the end one is only about half the leneth of the preceding joint; inner ramus con- 
siderably longer than the cuter, and the first jomt, which is as long as the entire outer 
ramus, 1s widest near the proximal end, but becomes narrower distally; the greatest 
width is equal to about two-fifths of the length ; second and third joints are small; the 
last is provided with one or two apical sete, and a moderately stout appendage which 
terminates in a small hook-like process (fig. 4). The fourth pair are small, and the 
inner ramus is shorter than the outer one; both rami are furnished with moderately 
long and slender marginal setze, and the terminal setze are also considerably elongated. 
Fifth pair small; basal jot not greatly produced interiorly, the interior part 
broadly rounded and provided with five elongated sete ; the space between the outermost 
seta and the next one is rather greater than that between the others; second joint 
subtriangular, and furnished with one seta on the inner margin, two setz on the outer, 
and two at the apex (see fig. 29, Pl. IX.). 
The male does not differ greatly from the female, but the basal joint of the fifth pair 
of thoracic legs is only shghtly produced interiorly, and bears two instead of five sete, 
while the second joint has three instead of two setze on its outer margin (fig. 6, Pl. III.). 
Habitat.—Scotia Bay, South Orkneys; collected in June 1903; Station 325, 
60° 43’ 42” S., 44° 38’ 33” W. 
Remarks.—This Antarctic Idomene so closely resembles the form described by 
Puitippl from the Mediterranean that I have scarcely any hesitation in referring it to 
the same species. The only difference of any importance is the small hook-like process 
at the end of the inner ramus of the first pair of thoracic legs. The occurrence of this 
species in the Antarctic collections made by the s.y. Scotia is of considerable import- 
ance. The distribution of Jdomene extends to the British and Norwegian coasts. 
Genus Dactylopusia, Norman, 1903. 
Dactylopusia frigida, new species. (PI. IL. figs. 19-25.) 
Female.—Body moderately stout, and somewhat similar to Dactylopusia neglecta, 
G. O. Sars, in its general appearance. Length, 0°85 mm. 
Antennules moderately short and composed of nine joints; the first four are stout 
and subequal; the sixth is about equal to the fourth, and rather longer than the pre- 
ceding joint; the seventh and eighth joints are very short, but the terminal joint is 
about equal in length to the fifth. Antennz small; outer ramus moderately elongated 
and composed of three joints, but the middle joint is very small. 
Second maxillipeds with the end joint oblong and furnished with a tolerably long 
slender claw. 
In the first pair of thoracic legs the inner ramus is moderately elongated and 
narrow, but the outer is short and only reaches to a little beyond the middle one; the 
second joint is nearly twice as long as the first, and the end one is very small. The 
next three pairs are tolerably stout; in the fourth pair the short inner ramus is some- 
