ENTOMOSTRACA OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 557 
what triangular in its general outline, and both the inner and outer margins taper to 
the narrow distal extremity. 
In the fifth pair, the inner portion of the basal joint, which is moderately produced, 
is transversely truncated, and furnished with about five apical setz ; the second joint is 
broadly ovate and is provided with six sete; the three setee on the inner margin, and 
one near the end of the outer margin, are tolerably stout, but the other two are 
somewhat slender. Caudal rami very short. 
Habitat.—Scotia Bay, South Orkneys; collected in June 1903; Station 325, 
60. 43’ 42” S., 44° 38’ 33” W. 
Dactylopusia ferriert, new species. (Pl. XII. figs. 14-22.) 
Female.—Body tolerably stout and elongated ; rostrum short ; abdomen somewhat 
reflexed ; caudal rami short (fig. 14). Length about 1 mm. 
Antennules short, scarcely reaching to the end of the first cephalothoracic segment, 
and apparently composed of seven joints, but the articulation between the fifth and 
sixth joints is not very clearly defined; the first and second joints are moderately 
robust ; the third is narrower than the second, and equal to about one and a half times 
its length ; the other joints are small and subequal, except the sixth, which is scarcely 
half the length of the one that precedes it; the antennules are tolerably setiferous, and 
the third joint bears an extremely long sensory filament (fig. 15). 
Antenne, as in Dactylopusia frigida. 
Maxillipeds small; the first pair are each armed with a stout terminal claw, and are 
also provided with two small marginal setiferous lobes, as shown in the figure (fig. 17) ; 
second pair narrow and elongated, and furnished with slender terminal claws that 
reach beyond the middle of the joints to which they are articulated (fig. 18). 
The first pair of thoracic legs have both rami tolerably stout; the first joint of 
the inner ramus, which is elongated and reaches nearly to the extremity of the outer 
ramus, bears a moderately stout seta near the middle of the inner margin; the end 
joints are very small, and bear stout, terminal, claw-like spines, as shown in the figure 
(fig. 19); a stout setiferous spine springs from the outer margin of the first and second 
joints of the outer ramus, and the second joint has also a seta on the inner margin ; 
the end joint of the outer ramus is very short and carries a tolerably stout setiferous 
spine on the outer margin; it is also furnished with two terminal claw-like spines 
and two slender and elongated setee—the inner one being considerably longer than 
the other; both rami are fringed on their outer margins with small bristles, and 
stout setiferous spines spring from the distal end of both the outer and inner margins 
of the second basal joint (fig. 19). 
The second, third, and fourth pairs are somewhat similar in structure to the same 
appendages in Dactylopusia brevicornis (Claus), except that the second joint of the 
inner ramus of the second pair is provided with two setz on the inner margin, while 
the same joint in the third and fourth pairs bears only one seta. In the third pair, 
