140 COPEPODA 



The elevation in front of the labruin is well developed but smooth. The labrum is rudimentary 

 without distinct setae, and so is the area labialis; both are soft-skinned with ringed chitin. Laterally 

 we observe one to two groups of very short hairs. 



YQ (St. V). Size of female from St. 167 Thor 1905 was 477 mm.; anterior division 3-80 mm.; 

 urosome 0-97 mm. A male from the same station measured 4-88 mm. 



Shape of body, but for four abdominal somites and more triangularly pointed lateral corners of 

 the thorax, is like that of the adult female. The Re I of the antennae apparently bears a setigerous 

 process like that of the adult male; the other appendages do not show features of interest. 



The only difference between the males and females is found in the presence of the fifth pair 

 of legs, which, as shown in text-fig. 37 e, has a rather characteristic structure. 



YQ (St. IV). Size of male from St 183 was 3-28 mm.; anterior division 270 mm. ; urosome 0-58 

 mm. Size of female from the same station 3-1 mm. 



The frontal keel is lower, and the lateral corners of the thorax are less pointed. The mouth- 

 appendages do not show features of great interest The Re II os III of the second pair of legs are 

 fused, have only 3 Se but the usual number of Si; a glandular pore is only found in Re III at the base 

 of Se 3; the fourth pair of legs has also a glandular pore in Re I, and has the inner margin of the second 

 basipodite smooth. The only difference between the male and female is found in the presence of a 

 fifth pair of legs with undivided Re and Ri as shown in text-fig. 37 f. 



Occurrence. The S/S Thor has taken a few specimens of this species at several stations. 



'9/ 6 1904 St. 152 65oo L. N. 28io L.W. i f? (with sperm.), i 1$, i yd 1 (V). 



2 Ye 1904 St 154 6527 L. N. 27io L.W. if? (with sperm.). 



IO / 7 1904 St. 180 6i34 L. N. i903 L.W. Yt 400 M. Wire 2 f? (with sperm.). 



V 9 1904 St. 285 6249 L. N. i846 L.W. i tj. 



/ 7 1904 St. 183 6i 3 o L. N. I7o8 L.W. Yt 1800 M. Wire n f?, 2 fd 1 , i y? (V), 6yd 1 (V), i y? (IV), 



i yd 1 (IV). 

 2 s/ 5 1904 St. 104 6247 L. N. i503 L.W. i f?. 



2 / 9 1904 St. 286 6i49 L. N. 14 1 1 L.W. 2 f ?, i yd 1 . 



*>/8 1905 St. 165 6ooo L. N. io35 L. W. i f?. 



/ 5 i904St 99 6ii 5 L. N. 935 L.W. if?. 



Outside the Ingolf area the species has been taken 



'5/ 6 1905 St. 82 5ioo L. N. n43 L.W. Yt. 1200 M. Wire if?. 



31/8 1905 St. 167 57*46 L. N. 9 5 5 L.W. Yt. 1500 M. Wire i f?, 3 fd\ i y? (V), i yd 1 (V). 

 % 1905 St. 72 5752 L. N. 953 L.W. Yt. 1500 M. Wire 6 f?, i fd", 2 yd 1 . 



Remarks. As this species was found not only in the Atlantic south of Iceland, but also in 

 Denmark Strait and in the Iceland-Fseroe channel, while it was wanting in some of the more southern 

 stations in which the two other species were found, it is possibly a more northern form. 



It belongs naturally to the same group as U. minor and major, though it is well distinguished 

 from both by combining the right lateral spine of the genital somite and the ventral spine on the 



