242 THE SCHIZOPODA. 
acters and especially by the copulatory organs. The antennular peduncles 
are a little longer and distinctly more slender than in E. lucens, with the second 
joint longer than the third, while in Z£. lucens it is not longer than the third; 
finally the lobe of first joint is a little less conspicuous than in H. lucens and differs 
slightly in shape. The rostrum, viz. the triangle at the middle of the front 
margin of the carapace, is generally more pronounced and more produced in 
FE. lucens than in EF. pacifica. And the copulatory organs afford excellent char- 
acters, but here I will only refer to the brief descriptions with figures of the most 
important parts of the copulatory organs of EH. pacifica, FE. lucens, and a third 
closely allied species, #. frigida H. J. H., found in my above-mentioned paper. 
Distribution The species is distributed in the temperate and boreal 
North Pacific; it is very common at Japan. The Copenhagen Museum possesses 
considerable material from seven localities at Formosa and especially from near 
Japan and Corea northwards to Lat. 39° N.; a future report on the fine material 
belonging to the U. 8. Nat. Museum will contain a fuller account of its distribu- 
tion. But here it may be stated that the specimens from four localities in the 
North Pacific — between Lat. 35° 193’ N. and Lat. 35° 363’ N., long. 125° 212’ W. 
and 124° 453’ W.— referred by Ortmann (in his paper in 1894) to Huphausia 
splendens Dana belong to E. pacifica. 
18. Euphausia tenera H. J. Hansen. 
1885. Huphausia gracilis G.O. Sars, Challenger Rept., 13, p. 89, pl. 15, figs. 12-23 (not Z. gracilis Dana). 
1905. Huphausia tenera H. J. HANsEN, Bull. Mus. Océan. Monaco, no. 42, p. 9. 
1910. Huphausia lenera H. J. HANSEN, Siboga-Exp., 37, p. 95, pl. 14, figs. 3a-3e. 
Sta. 4587. Oct. 12,1904. Lat. 20° 42’N., long. 107° 25’ W. 300fms. tosurface. 7 specimens. 
Sta. 4588. Oct. 12, 1904. Lat. 19° 52’ N., long. 106° 22’ W. Surface. 59 specimens. 
Sta. 4596. Oct. 14, 1904. Lat. 16° 47’ N., long. 100° 27’ W. Surface. 5 specimens. 
Sta. 4598. Oct. 15, 1904. Lat. 15° 58’ N., long. 98° 13’ W. 300 fms. to surface. 1 specimen. 
Sta. 4619. Oct. 20, 1904. Lat. 7° 15’ N., long. 82°8’ W. Surface. 1 specimen. 
Sta. 4634. Nov. 4, 1904. Lat. 4° 35.4’ N., long. 83°32.3’W. 300fms.tosurface. 1 specimen. 
Sta. 4635. Nov. 4, 1904. Lat. 3° 52.5’ N., long. 84° 14.3’ W. Surface. 5 specimens. 
Sta. 4637. Noy. 5, 1904. Lat. 1°31’ N., long. 86°32’ W. 300 fms. to surface. 27 specimens. 
Sta. 4638. Nov. 6, 1904. Lat. 0° 27’ N., long. 87° 13’ W. 300 fms. to surface. 21 specimens. 
Sta. 4640. Nov. 6, 1904. Lat. 0° 39.4’S., long. 88°11’ W. Surface. 134 specimens. it 
Sta. 4644. Nov. 7, 1904. Lat. 2° 13.3’5S., long. 89° 42.2’ W. Surface. 22 specimens. 
Surface. 87 specimens, 
Sta. 4646. Nov. 8, 1904. Lat.4°1.6’S. . 89° 16.3’ W. 2 
Sta. 4646. Noy. 8, 1904. Lat. 4°1.6"S., long. 89° 16.3’ W tes fms. to garface.. ‘aan 
Sta. 4648. Nov. 9, 1904. Lat. 4° 43’S., long. 87° 7.5’ W. Surface. 10 specimens. 
Sta. 4649. Nov. 10, 1904. Lat. 5° 17’S., long. 85° 19.5’ W. 300fms. to surface. 1 specimen. 
Sta. 4650. Nov. 10, 1904. Lat. 5° 22’S., long. 84° 39’ W. 300 fms. to surface. 11 specimens. 
~ nr ° 
Sta. 4652. Nov. 11, 1904. Lat. 5° 44.7’S., long. 82° 39.5’ W. { ree [ patrons spectral 
Sta. 4657. Noy. 13, 1904. Lat. 7° 12.5’S., long. 84° 9’ W. 300 fms. to surface. 4 specimens. 
Surface. 2 specimens. 
Sta. 4659. Nov. 14, 1904. Lat. 8° 54.5’S., long. 86° 5.5’ W. ‘ 300 fms. to surface. 4 specimens 
