350 Messrs. T. and A. Scott on some 
apex with a slightly clawed spine of moderate length and an 
elongated seta; the outer branches are scarcely equal in 
length to the inner ones; a stout spine springs from the 
outer distal angles of the first and second joints, while 
the third carries two similar spines and two elongated 
sete at its distal end. The second, third, and fourth pairs 
are somewhat similar to those of Dactylopus Strémit, but are 
rather more slender; figure 5 represents the fourth pair. 
The fifth pair in the present species has also a resemblance 
to the same pair in Dactylopus Strémit, but slight differences 
are observable, especially in the shape of the secondary joints, 
which are oval in form and about twice as long as broad 
(fig. 6); in these joints an elongate slender seta springs from 
near the middle of the interior margin and another from near 
its distal end, in addition to three long apical sete; the pro- 
duced part of the basal joint is also furnished with five sete, 
which are arranged round the distal half of the outer margin 
and apex, as shown in the figure. 
The stout lance-shaped spine, with which each of the caudal 
furca is armed, forms a character by which the species can be 
readily identified. The species is named in compliment to 
Mr. Bruce, who has done so much in the interests of Arctic 
and Antarctic research. 
Thalestris forficulus, Claus. 
This species was observed very sparingly in samples of 
bottom-material from 20 fathoms collected between Kolguev 
and Novaya Zemlya on June 11th; from the west side of 
Bear Island, collected on July 3rd; and from 27 fathoms off 
Hope Island, collected on the 6th of the same month. 
Thalestris Krohnit (Kroyer). 
Syn. Thalestris serrulatus, Brady, Monograph Brit. Copepoda, vol. ii. 
p- 138, pl. lix. figs. 2-11. 
This fine species, which sometimes makes its appearance in 
the British seas, was captured by tow-net between South 
Cape, Spitzbergen, and Bear Island on July 22nd, and in 
Kval Sound on the 24th of the same month ; both males and 
females were obtained. 
Thalestris helgolandica, Claus. 
This species occurred in a gathering from Kval Sound 
collected on July 24th, but only a single specimen was 
observed. 
