COPEPODS GATHERED BY ALBATROSS—WILSON 167 
reach the tips of the caudal rami and the left antenna is geniculate, 
the terminal portion 3-segmented. The second antennae, mouth parts, 
and first four pairs of legs are like those of the female. The fifth 
legs are asymmetrical, the right one longer and stouter than the left 
(pl. 4, fig. 26), with two curves giving it an S shape. The first two 
segments of the exopod have spines at their outer distal corners, 
long, slender, and acuminate. The second segment also has a short 
and stout spine on the surface at the distal end just inside the inner 
margin. The terminal segment is nearly three times as long as wide, 
bluntly rounded at its tip and without any spines or setae. The right 
endopod is apparently 2-segmented and attached to the inner margin 
of the basipod near the distal end. The first two segments of the 
left leg also carry spines at the outer distal corner, stouter than those 
on the right leg and slightly curved, and in addition the second seg- 
ment has a sinuous distal margin. The terminal segment is armed 
with three fingerlike processes, one on the outer margin near the base 
and two unequal in size at the tip. The left endopod is 1-segmented, 
and its enlarged tip is bilobed; like the right endopod, it is attached 
not to the end of the basipod but on the inner margin. Total length 
4.21 mm. 
Neotypes.—U.S.N.M. No. 70735; station 7, latitude 8°04’ N., longi- 
tude 52°47’ W., North Atlantic. 
Remarks.—The long frontal spine enables this species to be recog- 
nized at sight, and if desired the identity may be strengthened by the 
broad spines at the posterior corners of the metasome and the details 
of the fifth legs. 
ARIETELLUS GIESBRECHTI Sars 
PLATE 10, FIGURE 107 
Arietellus giesbrechti Sars, Bull. Mus. Océanogr. Monaco, No. 40, p. 21, 1905b. 
Stations 16; 4605; 4705; 5457. Established by Sars upon specimens 
obtained in the temperate Atlantic and fully described and figured in 
the Monaco plankton, this species does not appear in any of the other 
lists. This is the first record since the original discovery and the first 
from the Pacific Ocean. 
ARIETELLUS PAVONINUS Sars 
Arietellus pavoninus Sars, Bull. Mus. Océanogr. Monaco, No. 40, p. 22, 1905b; Rés. 
camp. sci. Albert de Monaco, No. 69, p. 383, pl. 120, figs. 1-6, 1925. 
Station 4722. Established by Sars upon specimens obtained near 
the Azores, reported by Farran from west of Ireland, and identified 
by Sars in this Albatross plankton from southwest of the Galapagos 
