﻿1 62 



COPEPODA 



The male of this stage differs from the female by the fairly well developed fifth pair of legs 

 (text-fig. 45 1). 



St. III. Size of specimen from Ingolf St. 19 was 2-65 mm. long; anterior division (1-26 -j- 0-63) 

 ^= I'Sg; urosome 076 mm. 



The rostrum is less prominent (text-fig. 45 m), and the lateral corners are regularly rounded ; 

 the abdomen consists of two somites only; the subapical seta is, as in i% much longer than St. 2. The 

 antennulae extend almost to the end of the furca; the usual long setae, which are more powerful in the 

 segment 7, are found, but the number of the short setae is nmch smaller, as the fused segments (4^5) 

 (2<^3) have only a single seta, as the .segment 6 — 10 do not po.sses any, and as Spr. is only found in 

 segment 19. No "JSsthetasken" were found in segment 12, but, as usual, in segments 5, 9, 14 and 18. The 

 measurements are distinctly different as the segments 19—24 are comparatively longer than in the pre- 

 ceding stages; the segments 24 "^25 are i-i, as long as segment 19. The mouth appendages are in the 

 main like those of the adult females, but the number of the setae is as a whole a little smaller, f. inst, 

 the Re of the maxillulae has only 8 setae. The two first pairs of legs are scarcely different from stage 

 IV; the pes III has in Re II<n)III only 2 Se and 4 Si, and the Ri is undivided; the pes IV has Re I— III 

 fused with a basal Se well separated from two distal ones. 



St. II. Size of specimen from Ingolf St. 19 was 179 mm. long; anterior division (0-92 + 0'4i) 

 = I "33; urosome 0-46. 



The lateral corner of the anterior division is not regularly rounded, and the rudimentary fourth 

 pair of legs is found as a wing-like expansion (text-figs 45 n — p). The subapical seta (Si) is thicker and 

 longer than the St. The antennulae, which almost extend to the end of the urosome, have several of 

 the proximal segments (1 — 18) more or less fused. A long distal seta is found in segments 3 co 4^ 6 <^ 7, 

 14 and 18. No "^^sthetasken" were found. Beyond the segment 18 the segments become suddenly longer; 

 the 19 is almost twice as long as the 18; the segments 19 — 23 are of almost equal length; the seg- 

 ments 24 cv 25 are 1-3 as long as 19. The mouth appendages show similar differences as in the preceding 

 stages; the viaxilhilae have only 7 setae in Re; the maxillae are less powerfully developed, as seen in 

 fig. 3 f. The maxilUpeds have only 2 setae in the middle of basipodite 3, as the median one is wanting. 

 The Ri possesses only 5 setae. 



The pes I \5 comparatively more clumsy; 3 Se are present, as in the preceding stages. The 

 pes II has the Re I indicated with well developed Se; in addition, 2 Se and 4 Si were found. The/rj /// 

 is like the pes IV of the preceding .stage, with 3 Se and 3 Si (text-figs 45 r— s). 



Occurrence. Davis Strait. The Danish Ingolf E.xpedition has in the southern part of the Davis 

 Strait as far north as 65° L. N. from ^s/^ — 28^^ 1895 taken 9 samples containing Euch. norvcgica; in the 

 following 5 a fairly big number was found. In the table (p. 163) a few stations south and south east 

 of Greenland are dealt with. 



As the species was found neither in any surface sample nor more north than 65°, there is reason 

 to suppose that the form does not belong to the fauna of the surface, but belongs to the northern 

 prolongation of the Atlantic fauna. Propagation has been found to take place at the mentioned season 

 in this region. 



