430 
PACIFIC SCIENCE, VoL XXI, July 1967 
this species accounts for 50-90% of the whole 
euphausiid material. 
On the other hand, it must be pointed out 
that, in a number of individuals, the inner pro- 
tuberance of the anterior margin of the second 
segment of the first antennal peduncle is trifur- 
cate (Fig. 1) and not simple or bifurcate as 
usually described (Hansen, 1912; Boden, John- 
son, and Brinton, 1955). In some specimens, 
this protuberance presents four spines (Fig. 2). 
distribution OF Euphausia gibboides 
This species was present more in the west 
than was previously known (see Table 1). 
The farthest westward that a specimen of E. 
gibboides was collected during the Alize cruise 
was 148°07 / W. This record extends the west- 
ward limit of distribution, recorded previously 
as 132°W (Brinton, 1962). 
The species is present between 148°07 / W 
and 126°W, rather common between 126°W 
and 109°10 / W, and common between 109° 
10'W and 92°20'W (beginning of the cruise). 
REFERENCES 
Boden, B. P., M. W. Johnson, and E. Brin- 
ton. 1955. The Euphausiacea (Crustacea) 
of the North Pacific. Bull. Scripps Inst. 
Oceanog., Univ. Calif., 6(8) :287-400. 
Brinton, E. 1962. The distribution of Pacific 
euphausiids. Bull. Scripps Inst. Oceanog., 
Univ. Calif. 8(2) :51— 270. 
Hansen, H. J. 1912. The Schizopoda. Repts. 
Sci. Res. Exped. Tropical Pacific. . . U. S. 
Fish. Comm. Steamer "Albatross.” Mem. 
Mus. Comp. Zook, Harvard College 35:177- 
296 . 
Fig. 1 . E. eximia. Protuberances of the distal end 
of the second segment of the first antennal peduncle. 
Foreground', outer protuberance (simple). Back- 
ground’. inner protuberance (trifurcate) ; on the 
right , beginning of the dorsal keel of the third seg- 
ment. 
Fig. 2. E. eximia . Inner protuberance of the distal 
end of the second segment of the first antennal pe- 
duncle, showing four spine-shaped denticules. 
