244 Part III —Nineteenth Annual Report 
apical sete, the two outer sub-apical sete are small, but the other two are 
moderately stout and unequal in length, the inner one being the longest, 
both are feathered on the distal half (fig. 23). Each foot of the fifth 
pair consists of a single uniarticulated branch, elongated and somewhat 
slender and spine-like ; this pair, instead of being situated on the ventral 
aspect, which is the usual position in the majority of Copepods, are placed 
well round towards the back, and are probably utilised for supporting 
between them the egg-sacs which combine to form a globular mass on the 
dorsal aspect of the genital segment of the abdomen. This globular mass 
is easily detached, and would be even more. so were it not supported: and 
kept. in position by the fifth feet (fig. 15). 
The first. segment of the abdomen is: of moderate size, but the other 
segments are small; the caudal furca. are very short and somewhat 
divaricate. 
Description of the male.—The male is about half the size of the female, 
being only *825 mm. (about the 4, ofian inch) in length. The cephalo- 
thorax is distinctly segmented, and of a somewhat oval outline, the 
cephalic segment is moderately large, being equal to about two-fifths the 
entire length of the cephalothorax, but the thoracic segments are small. 
The genital segment of the abdomen is somewhat dilated, and equal to 
about half the entire length of the remaining segments and the caudal 
furca combined, the posterior portion of the abdomen is composed of what 
appear to be seven or eight distinct articulations, but with the exception 
of the ultimate segment they are for the most part very small; the caudal 
furca, which are. scarcely equal in length to the last abdominal segment, 
are each provided with a.small seta near.the base of the outer margin in 
addition to a few short apical sete (fig. 16). 
The antennules are very short and four-jointed, the first joint is mode- 
rately large and. somewhat inflated, numerous delicate hairs. spring from 
its rounded; upper: surface, as shown in the drawing (fig. 24). The 
remaining joints are small, the second one and the last are furnished with 
several delicate hairs similar to those on the first joint. 
The thoracic feet.—The first four pairs. of thoracic feet are all two- 
branched, and the outer branches are all three-jointed and armed on their 
exterior margins with strong sabre-like spines, the first and second joints 
being each furnished with one of these spines, and the third joints with 
three, except that the third joints of the first pair carry four spines ; in all 
the outer branches the terminal spines are considerably larger than the 
others. Moreover, in the outer. branches of all the four pairs, the inner 
margins of the first joints: appear to be devoid of spines. or sete, but. the 
second joints. are each provided with one plumose seta on the inner 
margin ; on the. other hand, the third joints of the outer branches of the 
first pair have only four plumose. setz on their inner margin, while on 
the inner margin of the third joints of the next three pairs there are five 
plumose setz, so that though the outer branches of the first. pair have 
one spine: more than the other three pairs, the number of sete is corres- 
pondingly fewer. 
But although all the four pairs of thoracic feet are somewhat similar as 
regards the structure and armature of the outer branches, a. considerable 
divergence is observable when the inner branches are compared. In the 
first pair of feet the inner branches are composed of a single small but 
somewhat tumid joint bearing one or two claw-like spines (fig. 25). In 
the second and third pairs the inner branches are three-jointed, but con- 
siderably shorter than the outer branches; in each of the inner branches 
the first: joint bears one and: the second and third two moderately elon- 
gated plumose: sete, in addition to two small sabre-like terminal spines 
