Urocopia singularis G. O. Sars. 5 
3 in number, the outermost one quite simple, the other 2 jointed 
at the base, but more os less broken in the 2 specimens examined. 
As in most other Cyclopoida, moreover a very delicate sensory 
bristle occurs on each ramus dorsally, arising from a knob-like 
prominence at some distance in front of the apical lappet. A 
dense fascicle of fibres, apparently of nervous nature, enters each 
of the rami, spreading distally and adjoining partly the dorsal 
sensory bristle, partly the caudal sete, some of them also 
continuing within the apical lappet. By these fibres the caudal 
rami acquire a rather opaque appearance, which perhaps in the 
living animal may be still more pronounced by pigmentary deposits. 
Of eye no trace could be detected in either of the 2 spe- 
cimens. 4 
The anterior antennæ (fig. 3) are attached on each side 
of the truncated front and accordingly somewhat remote the one 
from the other. They are comparatively short and stout, not 
nearly attaining half the length of the cephalic segment, and are 
clothed with scattered simple bristles. The number of joints is 
apparently 6; but 2 of them, the 2nd and 3rd, are very imper- 
fectly separated. The 3 outer joints, on the other hand, are very 
Sharply defined and gradually diminish in size, all 3 combined 
occupying about */s of the length of the antenna. 
The posterior antenne (fig. 4), which are attached at a 
short distance behind the anterior ones, are about of same length 
as the latter, but somewhat narrower. They are of comparatively 
simple structure and almost naked, being composed of 5 joints, 
the first 2 of which are much the largest and nearly equal in 
size, forming together a sharp geniculate bend. The terminal part 
of the antenna, comprising the 3 outer joints, scarcely attains the 
length of the preceding joint and is much narrower. Its Ist joint 
is quite short and connected with the 2nd by an oblique suture; 
it carries at the end anteriorly a small curved seta accompanied 
by a still smaller hair-like bristle. The last joint is conically 
tapered, forming a comparatively short and nearly straight claw 
somewhat resembling that found in the siphonostomous Cyclopoida. 
The oral area, as in most other poecilostomous Cyclopoida, 
is located at rather a long distance behind the insertions of the 
antennæ, occupying about the centre of the cephalon. Its compo- 
sition agrees perfectly with that in other forms of this group and, 
according to the interpretation given by the present author in the 
