246 THE SCHIZOPODA. 



of first antennular joint, etc., that a close examination is necessary in order to 

 separate them with certainty. As pointed out in the "Siboga" Report, the male 

 copulatory organs of first pleopods afford excellent specific characters, and it 

 may be added that these organs in E. gibba differ strongly from those in the three 

 species mentioned by the very short and curiously shaped terminal process, 

 the very long and strong proximal process and the finger-shaped, very slender 

 and feebly chitinized terminal part of the median lobe. The female is very 

 similar to that of E. paragibba, the only difference being that the distal part of 

 the keel on the third antennular joint is a little higher and less rounded than in 

 the latter species. Furthermore E. gibba is generally smaller than E. paragibba 

 and differs in all probability in the living state by the colour of the body; the 

 Agassiz collection contains specimens of both species from a good number of 

 locahties, and while the specimens of E. paragibba are whitish or a little yellow- 

 ish, those of E. gibba are less or more yellowish or sometimes light brownish or 

 even somewhat saffron coloured. 



It is seen from the "Challenger" localities that Sars has confused at least 

 two species, because E. gibba does not occur in the Atlantic. He has marked a 

 specimen from the West Pacific, between Api and Cape York, as type, and his 

 fi^. 6 on PI. XVI shows that he has examined and figured a male of the species 

 described here as E. gibba. 



Distribution. — The list of localities shows that E. gibba was taken only in 

 the southern parts of the area investigated, viz. only South of Lat. 16° 32' S. 

 The Copenhagen Museum possesses two specimens from the South Pacific at 

 Lat. 27° 11' S., long. 88° 52' W. ("Galathea" Exp.), and the type of Sars was, as 

 already stated, taken between Api and Cape York. Sars states that he has seen 

 specimens of E. gibba taken off Kandavu, Fiji Islands, and during my visit to 

 London in 1907, I separated three of his thirteen specimens as being E. tenera, 

 but not having at that time discovered the importance of the copulatory organs, 

 and that therefore new species ought to be separated from the original E. gibba 

 material, I cannot state anything concerning the remaining ten specimens. 



But all statements in the literature as to the occurrence oi' E. gibba in the 

 Atlantic and the Indian Ocean are to be cancelled, as all the specimens re-exam- 

 ined by me belong to E. hemigibba H. J. H., E. pseudogibba Ortm., or E. 

 paragibba H. J. H. 



20. Euphausia paragibba II. J. Hansen. 

 1910. Euphausia paragibba H. J. Hansen, Siboga-Exp., 37, p. 100, pi. 14, figs. 6a-6d. 



Sta. 4679. Dee. 7, 1904. Lat. 17° 26.4' S., long. 86° 46.5' W. 300 fms. to surface. 5 specimens. 

 Sta. 4681. Dec. 8,1904. Lat. 18° 47.1' S., long. 89° 26' \V. 300 fms. to surface. 7 specimens. 



