EUPHAUSIA RECURVA. 233 
enumerated above proves that #. eximia must be extremely common in the ma- 
jor part of the area of the East Pacific investigated by Dr. Agassiz in 1904-1905, 
but yet not found South of Lat. 142° S., in the whole southwestern part South of 
the line, towards Manga Reva, nor in the inner part of the Gulf of Panama; 
and not a specimen has been taken near the Fiji Islands, nor, so far as I know 
at present, in the tropical West Pacific.— The list shows that the species was 
rather frequently taken at the surface. 
13. Euphausia recurva H. J. Hansen. 
Plate 7, figs. 3a-3n. 
1905. Euphausia recurva H. J. Hansen, Bull. Mus. Océan. Monaco, no. 42, p. 13. 
Sta. 4576. Oct. 8, 1904. Mat. 29° 52’ N., long. 116° 56’ W. Surface. 24 7,1 fjuv.,1 9. 
Description.— The frontal plate (fig. 3a) very short and shaped as in E. 
eximia; the rostrum is very acute, shaped as a rather narrow or very narrow 
triangle, from a little to considerably longer than the breadth of second antennu- 
lar joint; the keel from the basal part of the rostrum to the posterior end of the 
oblong dorsal area nearly as in E. eximia. 
The eyes are medium sized, a little smaller than in EZ. erimia.— The anten- 
nular peduncles show interesting features. The basal joint is slightly more than 
twice as long as broad, as long as the sum of the two other joints, and the upper 
distal lobe differs extremely in the two sexes. In the male (figs. 3b and 3c) 
it is a very oblong-triangular plate much longer than broad, longitudinally some- 
what curved so that it is less or more hollowed, at the base from a little less to a 
little more than half as broad as the end of the joint, at the end acute or even 
acuminate, directed upwards and somewhat backwards. In the female the 
lobe is vertical or a little recurved (figs. 3d and 3e), somewhat more than half 
as broad as the end of the joint, with the lateral margins subparallel, while the 
distal margin is deeply and more or less obliquely concave; the distal part of 
the lobe is therefore shaped as two triangular, acute processes either nearly 
equal in length or the inner somewhat or much longer than the outer, which 
sometimes is short. The two distal antennular joints are thicker in the male 
than in the female. Second joint increases somewhat in breadth from the base 
to considerably beyond the middle; its terminal upper margin is somewhat 
oblique; a little inside and behind the distal outer angle a thick, angular pro- 
tuberance or short, obliquely conical tubercle is seen, while a little inside and 
behind the distal inner angle a slender, spiniform, acute process projects forwards 
