COPEPODA 



*93 



Description. f$. Size of specimens from Ingolf St. 105 was 223 mm; anterior division r66 mm.; 

 nrosome 0-57 mm. Sars' specimen measured scarcely 2 mm.; Farran's 23 — 25 mm. 



The shape of the body is scarcely different from Sars' figures; the appendages, as far as they 

 were examined in the single mutilated specimen, were scarcely different; posteriorly, near the end of the 

 second outer segment of the first pair of legs, a transverse row of short spines was found. The fifth 

 pair of legs has on the left side the Se standing opposite the Si, as in Sars' figure, but on the right 

 side it stands somewhat more distally. 



fo*. Size of specimen from St. 82 Thor was 2 - 5 mm.; anterior division 1-65 mm.; nrosome 0-85 mm. 

 A male from St. 183 measured 3-3 mm. 



The shape of the body is rather slender, very much like that of S. magnus. The distinction 

 between the head and first tergite is indicated dorsally, and the fifth thoracic tergite, which is rounded, 

 is well marked out. The rostrum consists of a basal bifurcate part, which 

 is prolonged into a thin rather stiff filament on each side; the outline 

 is, above the rostrum, at least in the single, somewhat mutilated specimen, 

 somewhat concave. The abdomen (fig. 7 a) is distinctly half as long as the 

 anterior division, and the comparative length of the somites is 7, 43, 27, 

 30, 4, and 10 for the furca, which is about 1-3 as long as wide. 



The antennulae, which were broken, have the proximal segments 

 like those of .5". magnus. The antennae are scarcely different from those of 

 the female. The manducatory part of the mandibulae is rather slender; the 

 third basipodite is very short and robust; it possesses, somewhat beyond 

 the middle, a single short hair and, more terminally, at least one quite rudi- 

 mentary one. The maxillulae are well developed and in most respects like 

 those of the female. The long well developed Li I has 10 short setae at 

 least, the Li II has one, the Li III has 3 at least, and the third basipodite 

 has 5; the Ri I has 2, and the Ri III os II have 5 setae; the exopodite 

 has 7 well developed setae. The maxillae and maxillipeds are in most 

 respects like those of the preceding species. 



The natatory legs were scarcely different from those of the female; 

 on the posterior surface of the third outer segment in the first pair of legs no spines were observed. 

 The fifth pair of legs (fig. 7b and text-fig. 59b) is in the main like those of the preceding species, 

 but differs, however, in a few respects. The inner terminal process of the first outer segment of the 

 right foot is somewhat pointed, not rounded; the right endopodite has the two first segments some- 

 what convex with a small inner terminal process, which was not observed in the bigger specimen ; the 

 terminal segment is better articulated. The left right leg is scarcely different from that of the preceding 

 species except in minor details, as seen when comparing figures (text-fig. 59 b); the left Re III has 3 

 fairly long setae. 



Occurrence. The Ingolf Expedition has gathered a single mutilated female with closing net 

 700 fathoms «/ 7 1896 St. 105 65°34 L N. 7^1 L W. 



The S S Thor has gathered a single male: 



Text-fig. .59. Scaphocalanus bre- 



vicorm's G. O. Sars. f o". 

 a. Pes V dext X c. 150. b. Pes 

 V in situ from the left; termi- 

 nal segments '/ e. 250. 



The [ngoIf-Expedition. III. 4. 



25 



