246 THE SCHIZOPODA. 
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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 L. 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 thanin 
the latter species. Furthermore £. gibba is generally smaller than 2. 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 
localities, and while the specimens of 2. paragibba are whitish or a little yellow- 
ish, those of 2. 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 #. 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 
fig. 6 on Pl. XVI shows that he has examined and figured a male of the species 
described here as FE. gibba. 
Distribution.— The list of localities shows that 2. 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 Pacifie 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 H. gibba taken off Kandavu, Fiji Islands, and during my visit to 
London in 1907, I separated three of his thirteen specimens as being LH. 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 2. gibba 
material, I cannot state anything concerning the remaining ten specimens. 
But all statements in the literature as to the occurrence of #. gibba in the 
Atlantie and the Indian Ocean are to be cancelled, as all the specimens re-exam- 
ined by me belong to FL. hemigibba H. J. H., EB. pseudogibba Ortm., or £. 
paragibba H. J. H. 
20. Euphausia paragibba H. J. Hanspn. 
1910. Luphausia paragibba H. J. HANSEN, Siboga-Exp., 37, p. 100, pl. 14, figs. 6a-6d. 
Sta. 4679. Dec. 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’W. 300 fms.to surface. 7 specimens. 
