COPEPODA 191 



YQ (St. V). Size of male from Thor St. 183 was 3-94 mm.; anterior division 3-04 mm.; urosome 

 0-90 mm. Another specimen measured 4-12 mm. 



The shape of the body is in the main like that of the adult females, but the articular line be- 

 tween the head and the first thoracic tergite is fairly distinct; the fifth thoracic somite is well marked in 

 front with produced pointed lateral corners directed somewhat downwards (text-figs 58 j k; Pl.VIII fig. 6f). 



The antennulac almost reach the end of the body; the other appendages are scarcely different 

 from those of the adult female; the spinulation of the anterior surface of the natatory legs is well 

 developed. 



The only difference between the sexes is found in the fifth pair of legs, which in the male has 

 2 fairly elongated basal segments and a two-segmented exopodite in addition to a somewhat shorter 

 endopodite (PI. VIII fig. 6 g). 



Variation. In an adult female from Thor St. 183, which had the lateral corner of the thorax 

 produced as in text-fig. 58 g, but in no other respects differed from the described specimens, the fifth 

 pair of legs was distinctly asymmetrical with a rudimentary endopodite (Pl.VIII fig. 6c); in another 

 female (Nr. 2) with the same shape of the lateral corner, the pes V was symmetrical and like the right 

 leg in Nr. i, but with strong inner seta and rudimentary outer one; in a third specimen, like the 

 others from St. 183 (Nr. 3), a fairly well developed endopodite was found, and two Se were present in 

 the exopodite; in a fourth specimen from Thor St 152 (Nr. 4) with the lateral corner like text-fig. 58 b, 

 the third outer segment has two terminal setae, but no endopodite was found. The pes IV in an ab- 

 normal specimen is seen in fig. 6 b (PI. VII). 



Occurrence. The Ingolf Expedition has not gathered any specimen of this species, probably 

 because it prefers the deeper strata, at least in the northern regions; by the Thor it has been gathered 

 at a good many localities. It is rather curious, that the young males of the penultimate stage are much 

 more common than the young females; of the examined 34 young specimens only 5 were females. 



In Denmark Strait: 



'9/ 6 1904 St. 152 6soo L,. N. 28io L.W. Yt M.Wire 18 f ?, 3 yc? (V). 



Yt? 2 y^ (V). 



2I /6 1904 St. 154 6s27 L. N. 27io L.W. Yt? i <?. 



2 % 1904 St. 150 655o L. N. 2053 L.W. Yt? 12 f? (i sp.), i yd*. 



South of Iceland the species was taken at 3 stations viz: 



V, 1904 St 285 6249 L. N - I8 4 6 L.W. Yt 500 M. Wire 6 f?, 2 y$, 6 y<}. 

 "/ 7 1904 St. 183 6i30 L. N. I7o8 L.W. Yt. 1800 M. Wire 28 f? with rounded lateral corner, 15 f? 



with lateral corner more or less produced and 3 f $ with Ri pes V, i f J*, 2 y? (V), n yc? (V). 

 2 V 5 1904 St 104 6247 L. N. I503 L.W. Yt. 1500 M.Wire 25 f?, i yd 1 . 



In the Iceland Fseroe channel it was taken at 4 stations viz: 



2 9/ 8 1905 St 165 6ooo L. N. io35 L. W. Yt. 1000 M.Wire i f?. 



'/ 9 1905 St. 167 57^7 L. N. n33 L.W. Yt 1500 M. Wire 27 f?, i y?, 2 yd 1 . 



9/ 5 1904 St 70 6 3 32 L. N. 620 L. W. Yt 100 M. Wire i f ?. 



2 3/ 7 1905 St. 124 6io4 L. N. 433 L.W. Yt 1000 M.Wire 2 f?. 



