452 Part 111.—Twentieth Annual Report 
(1) Scolecithrix brevicornis, G. O. Sars. Pl. XXV., figs. 1 and 2. 
1900. WScolectthrix brevicornis, G. O. Sars, The Norw. N. Polar 
Exped. (1893-96), p. 49, pl. x. 
Description of the Male.—Length 1:5 mm. (about 54 of an inch). 
Body viewed from above, elongate-oval ; equal torather more than two-thirds 
of the entire length, widest behind the middle. The anterior somite is 
equal to nearly twice the entire length of the next three: abdomen, 
slender, scarcely half as long as the thorax. Antennules moderately 
short, scarcely reaching to the first abdominal segment, the first seven 
joints very short, the eighth to the (?) twelfth coalescent, the remaining 
joints somewhat similar to those of the female. 
The fifth thoracic feet were slightly damaged, and the following 
description of them is to some extent imperfect. The left leg is composed 
of four joints, the first is swollen but scarcely as long as the next, the third 
and fourth, which are sub-equal, are also rather shorter as well as being 
more slender than the second. The right leg consists of three (? or four) 
joints, the first and second are moderately elongate, the third is some- 
what shorter and narrower, alongside of third joint and articulated with 
it to the end of the second is a slender branch-like appendage equal in 
length to the third joint (fig. 2). 
Habitat.—Collected about sixty miles to theeast of the Shetland 
Islands on May 22nd, 1901. In the same gathering were obtained 
Metridia longa, Xanthocalanus (?) borealis, and one or two other rare cope- 
pods. The copepod which I have provisionally ascribed to Scolecithria 
brevicornis agrees with the female described by Professor G. O. Sars in its 
general form, in the proportional lengths of the thoracic segments, and in 
the comparatively short antennules. Sars did not obtain the male of his 
species, and there is therefore some uncertainty as to whether our 
specimen belongs to. that species or not. This gathering was from 
moderately deep water. 
Xanthocalanus (?) borealis, G. O. Sars. Pl. XXII, figs. 8 and 9. 
1900. Xanthocalanus borealis, G. O. Sars, Crust. of Norw. N. 
Polar Exped., p. 49, pl. xi. 
A female specimen of a Xanthocalanus was obtained in a tow-net 
gathering collected to the eastward of the Shetland Islands on 
May 22nd, 1901. It was thought at first that this specimen might 
belong to the Xanthocalanus minor, Giesbrecht, but on a careful comparison 
of it with the description and figures of that species and with the 
description and figures of G. O. Sars’ Xanthocalanus borealis it was found 
to agree much better with the latter than with the former species. 
Prof. G, O. Sars, in the portion of his new work on the Crustacea of 
Norway, just published,* gives a figure of the fifth pair of thoracic feet 
of a slightly immature female, which agrees fairly well with the drawing 
of the fifth pair of the Shetland specimen (fig. 9). 
This specimen (fig. 8) measures 2°89 mm. (rather less than an eighth 
of an inch) in length. The cephalothorax is moderately robust, 
and when viewed from above the width is seen to be equal to 
more than a third of its entire length, the sides are evenly rounded, and 
the posterior thoracic segment is produced on each side into acute angular 
processes which reach beyond the middle of the first abdominal segment. 
A minute seta springs from each side of the second-last thoracic somite. 
*Crustacea of Norway, by G. O. Sars, vol. iv. (Copepoda), parts iil. and iy. (1902), p. 46, 
Dl, -XXKIiy, Kea. 
