144 COPEPODA 



Ri I in the third pair of legs has a fairly distinct accessory tooth, but in other respects scarcely any 

 difference was observed between the natatory legs of the male and female. 



The fifth pair of legs is in general structure most like that of Undeuchatc minor (PI. V fig. 4 e), 

 to the description of which I partly refer. The right endopodite is about as long as the first segment 

 of the exopodite, enlarged distally and here gutter-shaped; on the posterior surface near the base a 

 short tooth was observed, and along the outer margin a short and low lamina. The first and second 

 segments of the right exopodite are completely fused, and have in the middle an obtuse angle open 

 outwards; the outer margin has proximally two large teeth and a smaller one, and the posterior surface 

 has, near the end, one or two raised keels; the third segment of the exopodite is gutter-shaped, like that 

 of Undeuchaete s. s., but has a terminal, well articulated seta, two thirds as long as the segment. 



The third basipodite of the left leg has inwards near base a blunt tooth; the endopodite is 

 slender, projects beyond the end of the first segment of the exopodite, and it distally somewhat hol- 

 lowed; the second segment of the exopodite is rather short, has the inner surface distinctly hollowed, 



i 



and has inwards near the end a strong, rather short spine with a blunt accessory tooth as well as a 

 rounded process; the third segment of the left leg (fig. 4f) is similar to that of Undeuchcete, but is less 

 slender, and possesses a short bristle in addition to the terminal setae, which are distinctly half as long 

 as the segment 



Yrf (St. V). Size of female from Thor St. 88 was 4-0 mm.; anterior division 3-15 mm.; urosome 

 0-85 mm. A male measured 4-02 mm. 



The shape of the body is in the main like that of the adult male, but the frontal crest is some- 

 what lower, and the lateral corners are triangularly pointed, and scarcely different on the two sides; 

 the limitation, between the head and the first tergite as well as between the fourth and fifth ones, is 

 fairly distinct (text-fig. 38 j). The first abdominal somite is better produced in the male than in the 

 female. The appendages show the usual differences from those of the adult female; the inner margin 

 of the second basipodite is smooth in both sexes. The fifth pair of legs is, as seen in text-fig. 38 k, 

 fairly well developed. 



Occurrence. The S/S Thor has in the Atlantic south of Iceland gathered this species at four 

 stations viz: 



% 1904 St. 285 6249 L. N. i846 L. W. 2 f ?, i y<? (V). 



/ 7 1904 St. 183 6i30 Iv. N. I7o8 L. W. Yt. 1800 M. Wire i f ?. 



2 V 5 1904 St 180 6247 L. N. I503 L. W. Yt. 500 M.Wire if?, i y? (V). 



*/ 8 1905 St. 163 6336 L. N. i205 L.W. Yt. 300 M.Wire i f?. 



Farther south the species was in one of five samples taken in big numbers. 



's/ 6 1905 St 82 5ioo L. N. n43 L. W. Yt. 1200 M.Wire i fo*. 



3'/8 1905 St 167 5746 L. N. 9 55 L.W. Yt 1500 M. Wire 5 f?. 



8 / 6 1905 St. 72 5752 L. N. 953 L.W. Yt 1500 M.Wire 5 f ?. 



2I / 6 1905 St 90 4747 L. N. 8oo L.W. Yt. 300 M.Wire 5 f ?. 



30/61905 St. 88 4809 L. N. 830 L. W. Yt 300 M.Wire 137 f ?, 7 frf, 27 y? (V), 62 yd 1 (V). 



