544 DR THOMAS SCOTT ON THE 
rounded apex; the outer margin of the second joint is nearly parallel with the inner, 
and near the extremity of the joint both margins converge to the angular apex ; four 
setee spring from the lower end of the outer margin and apex of this joint, and one from 
the lower end of the inner margin; all the setee are moderately slender. Caudal rami 
very short. 
Habitat.-_Obtained on floating seaweed collected in the North Atlantic on 29th June 
1904, between Cape Verde Islands and the Azores, Station 537, 29° 54’ N., 34° 10’ W. 
Remarks.—The form described above has a close resemblance to Harpacticus gracilis, 
Claus, and it may ultimately have to be ascribed to that species. Meanwhile, as no 
male specimens have been observed, and as there are one or two slight differences 
between the two forms, as, for example, in the structure of the antennules and of the 
fifth pair of thoracic legs, it is perhaps better that the specimens from the Scotia's 
collections should be recorded under a distinct name. 
Harpacticus pirier, new species. (Pl. V. fig. 15; Pl. XI. figs. 18-25.) 
Female.—Body moderately stout, somewhat resembling Harpacticus chelifer, 
O. F. Miiller, in its general form. Length about 0°85 mm. 
Antennules composed of nine joints; the first four tolerably stout and elongated, 
the others small, so that, together, they are scarcely equal to a fourth of the entire 
length of the antennule (fig. 18, Pl. XI.). Antennz and mouth appendages nearly as 
in Harpacticus chelifer. 
The first pair of thoracic legs are tolerably slender, and somewhat similar to the 
species mentioned ; the other three pairs are also somewhat similar to those in the 
same species, except that in the second pair the inner ramus is nearly as long as the 
outer one. 
The fifth pair has the basal joint broad and its inner portion only slightly produced, 
and provided with four setze of unequal lengths on its distal margin, the second seta 
from the outside being much longer than the others. The second joint is subtriangular 
in outline, the greatest width, which is near the proximal end, being about equal to 
half the leneth; the inner margin is nearly straight, but the outer is rounded and 
curves obliquely to the distal extremity: this joint is provided with six sete of un- 
equal lengths—two, having a considerable space between them, on the lower half of 
the outer margin, two close together at the apex, and two at the distal end of inner 
margin—the second seta from the inside being very small (fig. 15, Pl. V.). 
The caudal rami in this species are very short. 
Halitat.—Scotia Bay, South Orkneys, in siftings from some dredged material 
collected in 9 to 10 fathoms, in April 1903, Station 325, 60° 43’ 42” S., 44° 38’ 33” W. 
Remarks.—This species, though it resembles Harpacticus chelifer in some respects, 
differs distinctly in the form and armature of the fifth pair of thoracic legs, and also 
in the structure of the antennules. Named in compliment to Dr J. H. Harvey Pirig, 
one of the Scotia naturalists, 
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