COPEPODS GATHERED BY ALBATROSS—WILSON 313 
since disappeared, a male and female have been designated to serve 
as neotypes. 
Female——Metasome elliptical, twice as long as wide and narrowed 
but little at each end. Head separated from the first segment and 
broadly rounded in front, with a small median protuberance over the 
base of the rostrum. Fourth and fifth segments separated, the spines 
at the posterior corners of the latter acuminate and reaching almost 
to the posterior margin of the genital segment. These spines are 
flanged on the inside at the base, with a small knob at the inner corner 
of the flange. Urosome more than a fourth as long and wide as the 
metasome, somewhat asymmetrical, and 2-segmented. Genital seg- 
ment as wide as long and without a ventral protuberance, but with 
the upper surface produced at the left posterior corner into a finger- 
like process that just reaches the left caudal ramus. Anal segment 
wider than long and obliquely truncated at the posterior corners. Cau- 
dal rami asymmetrical, the right one half as large again as the left, 
each with five setae of equal length. 
First antennae short, reaching only to the middle of the fourth 
thoracic segment and sparsely setose. Endopod of second antenna 
much longer than the exopod and very slender. Endopod of first legs 
3-segmented and just reaching the distal margin of the second exopod 
segment. Exopods of fifth legs twice as long as endopods and curved 
inward, with three small spines on the outer margin and three larger 
ones at the tip, one terminal and the other two on the inner margin 
close to it. The distal half of the endopods is bifurcate, with acute 
branches. The first basipod in each leg has a large knob on its outer 
margin close to the distal end. Total length 2.50 mm. Metasome 2.24 
mm. long, 1.05 mm. wide. 
Male.—A little smaller than the female; metasome short and stout, 
but with the spines at the posterior corners asymmetrical. The one on 
the right side is long, slender, and more or less curved, reaching the 
third or the fourth segment of the urosome according to the amount of 
curvature. The spine on the left is straight, acuminate, and a fourth 
toa half as long asthe other. The urosome is a third as long and wide 
as the metasome and 5-segmented, the segments about the same width 
but differing in length. The third segment of the urosome has a small 
knob projecting laterally on the right side and plainly visible in dorsal 
view. The caudal rami are symmetrical, enlarged distally, and twice 
as long as wide, the outer seta on the outer margin one-third of the 
length from the distal end. 
The first antennae are a little longer than in the female, and the 
enlarged portion of the right one is shown in figure 477. This has two 
distinctive specific characters: first, the exceptionally long terminal 
portion, which apparently contains but two segments (although the 
arrangement of the setae on the second of these segments indicates 
