EUPHAUSIA PACIFICA. 241 
terranean. The Copenhagen Museum possesses specimens from four localities 
in the North Atlantic: — Lat. 37° N., long. 41° W.; Lat. 33° N., long. 47° W.; 
Lat. 24° N., long. 22° W., and Lat. 23° 31’ N., long. 22° 4’ W.: furthermore 
‘ 
from one place in the South Atlantic: — Lat. 224° S., long. 292° W., from one in 
the Southern part of the Indian Ocean about at Lat. 23° S., long. 814° E., 
finally from a place at Japan: — Lat. 31° 20’ S., long. 132° 29’ E.— Most of the 
specimens recorded have been taken at the surface. 
Group b. Species with a single pair of lateral denticles on the carapace. No 
dorsal process on third to fifth abdominal segment. 
17. Euphausia pacifica H. J. Hansen. 
Plate 7, figs. 5a-5b. 
1911. Huphausia pacifica H. J. HANSEN, Bull. Mus. Océan. Monaco, no. 210, p. 28 (with two figures 
in the text). 
4 fms., surface net. 1 immature speci- 
men. 
300 fms. tosurface. 28 immature speci- 
mens. 
Sta. 4571. Oct. 7, 1904. Lat. 33° 40’ N., long. 119° 35’ W. | 
Description.— The frontal plate is extremely short, without any real rostral 
process, but at the middle feebly produced as a triangle several times broader 
than long, with the vertex in the adults generally rounded, rarely acute, in 
immature specimens rounded or acute. 
The eyes are extremely large; the distal joint of the stalks short.— The 
antennular peduncles are somewhat long, more slender in immature specimens 
(fig. 5a) than in adults; lobe of first joint is in the adults a small, oblong-triangu- 
lar, acuminate, and acute process; in specimens a little more than half grown 
it is somewhat shorter in proportion to breadth (fig. 5b). Second joint is dis- 
tinetly longer than the third, with the inner distal angle on the upper surface a 
little produced, acute. 
The copulatory organs afford excellent specific characters, but as all speci- 
mens in the Agassiz collection are far from adult I have not figured these organs; 
in the recently published description of this species, quoted above, I have given 
a preliminary representation of the organs and may now refer to that paper. 
One of the largest specimens in the Agassiz collection is only a little more 
than half-grown and measures 11 mm. in length, while adults are generally 
18-22 mm. long. 
Remarks.— This species is closely allied and similar to H#. lucens H. J. H. 
(= E. splendens sens, G. O. S.), but it is well distinguished by a few small char- 
