452 Part III. — Tiventieth Annual Report 



(?) Scolecithrix brevicornis, G. 0. Sars. PI. XXV., figs. 1 and 2. 



1900. Scolecithrix brevicornis, G. O. Sars, The Norw. N. Polar 

 Expecl. (1893-96), p. 49, pi. x. 



Description of the Male. — Length 1*5 mm. (about -^ of an inch). 

 Body viewed from above, elongate-oval; equal to rather 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 the east of the Shetland 

 Islands on May ^2nd, 1901. In the same gathering were obtained 

 Metridia longa, Xantliocalanus (?) borealis, and one or two other rare cope- 

 pods. The copepod which I have provisionally ascribed to Scolecithrix 

 brevicornis agrees with the female described by Professor G. 0. 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. 0. Sars. PI. XXII., figs. 8 and 9. 



1900. Xanthocalanus borealis, G. 0. Sars, Crust, of JSTorw. N. 

 Polar Exped., p. 49, pi. 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. 0. 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. 0. Sars, vol. iv. (Copepoda), p arts iii. and iv. (1902), p. 46, 



pi. xxxi., xxxii. 



