200 COPEPODA 



S.-validus by the presence of a proximal seta in segment 17; the measurement is like that of the pre- 

 ceding species, but for the segments 8^9 and 19 which are of equal length. The manducatory part 

 has 3 setae in the third basipodite, but in other respects the mandibulae as well as the antennae and 

 maxillulac are scarcely different from those of the preceding species. The maxillae and maxillipeds 

 show, as pointed out by Far ran, a few rather unimportant differences. 



The first pair of legs is scarcely different from Farran's description, and the second pair is 

 very similar as well; the Se of the first outer segment is short and robust; the anterior surface of the 

 third basipodite as well as of the two branches is covered all over with areas of small spinules; on 

 the posterior surface the number of teeth is like Farran's fig., but a patch of distinct teeth is found 

 near the apex of the third basipodite. The terminal seta is adorned with about 20, well separated, coarse 

 serrations. A glandular pore was observed at the base of Se 3 Re III. The third pair of legs has, along 

 the exterior border of the second basipodite, a low lamina, which, in the middle, has a row of 15 20 

 fairly long spines not observed in the other species, and most distinct when 

 observed in situ; the spinulation, especially of the anterior surface, is better marked 

 than in the second pair; on the posterior surface of the third basipodite it is 

 scarcely better developed. The inner tooth of the anterior surface of the third 

 basipodite is short and rounded. The second basipodite of the fourth pair of legs 

 is comparatively less slender than in the preceding species; the inner tooth of 

 the third basipodite is just indicated; the spinulation of the anterior surface of 

 the basipodites as well as of the first outer and inner segments is well developed ; 

 the distal segments of the exopodites as well as the eudopodites are wanting. 



Text-fig. 63. The fifth pair of legs is scarcely different from Farran's description. 



Scaphocalanus globiceps 



Farran. fp. The anterior surface of the labrinu seems, in most respects, to be like 



a. Head x 33 . b. Ge- t }j at o f $ obtusifrons (PI. VII fig. Q b), but the oral surface differs distinctlv from 

 nital somite X 33- 



that species (PI. VII fig. 10 a, cf. fig. gc); the most characteristic feature is found 



in the distinct spinulation behind the marginal setae aroxmd the two first median circular spots and 

 as far lateral as the first well developed group of short spines; as to the other features I refer to the 

 figure. The lamina labialis is scarcely indicated; in front of it, the usual inner and outer row is seen 

 (fig. lob); posteriorly, between the serrula 6-dentata, a median group of short spines is found, as well 

 as a paired one more behind. In the middle, behind the labial lobe, two more or less separated groups 

 of shorter and longer hairs are found, laterally continued into a wide oblique row along the inner 

 margin of the lobe. More laterally the lobe possesses an angle-shaped series of densely placed hairs 

 as well as a basal group without direct connection. 



fc?. Size of specimen from Thor St. 180 was 4-44 mm.; anterior division 2-99; urosome 1-45111111. 



The body is somewhat more slender than in the female, and the abdomen is about half as long 

 as the anterior division; the comparative length of the abdominal somites is 15, 45, 40, 45, 4 and 14; 

 the furcal rami are about 1.3 as long as wide. The antennulae reach somewhat beyond the end of the 

 third abdominal somite; the segment 13 is fairly well separated from 12, and segment 14 from 15, but 

 segments 20 and 21 are completely fused on the right side, but well separated on the left; beyond 

 segments 8^9 2 setae were found only in segments 12 and 14. Segment 22 is 1-4 shorter than seg- 



