
NICHOLLS—COPEPODA FROM SOUTH AUSTRALIA 49 
spine distally and the end segment has a large terminal claw and accessory seta, 
and a small inner branch armed with spines. The maxilliped is three-segmented, 
the basal seement armed with two long setae, the second with an inner projection 
or bulge bearing two spinous setae, and the terminal segment bears two unequal 
claws and some setae. The swimming legs are of the usual structure with the 
following seta formula : 
endopod. exopod. 
pl 1.1.51. 0.1.62. 
p.2 1,2,33. 0.1.54. 
pa 1.2.24. 0.1.54. 
p-4 1.2.14. 0.1.58, 
The setae and spines are arranged in a more or less continuous series around the 
margins of the distal segments of these legs so that it is difficult to decide how 
many are terminal and where the inner and outer begin or end. No attempt 
has been made to express the distribution of the setae on the end segments in the 
formula, the figures refer to the number of setae and spines respectively. On the 
end segment of the third exopod the figures given are 54, but on the other leg of 
that pair there were five setae, but only three spines. The fifth leg is two-seg- 
mented, the basal segment armed with a short seta and the distal segment with 
one spine and one seta terminally and two outer lateral spines. 
Male. Length 1:17-1:20 mm. The body is like that of the female, but the 
urosome is five-segmented. At the postero-distal corners of the genital segment 
there is a spine representing the sixth legs. The only appendage showing any 
difference from the female is the maxilliped which, as usual in this group, is much 
more strongly prehensile than that of the female. The terminal claw is much 
longer and more strongly developed and the whole of the inner edge of the middle 
segment is armed with a series of short stout spines; this segment is roughly tri- 
angular in shape due to the greater development of the inner prominence found 
also in the female. The seta formula for the swimming legs is like that of the 
female. 
This species resembles callianassae Wilson (1935) and purpureus Boeck 
(Sars, 1917) in having the genital sezment undivided, though in the former this 
segment is no longer than the preceding segments. It further resembles purpureus 
in the comparatively short caudal rami. It is distinguished from this species, 
however, by the structure of the second antennae in which it resembles pugettensis 
Light and Hartman (1937) and thysanotus Wilson (1935) in having the third 
segment swollen and laterally produced, though without the distal extension 
found in these species and so noticeable in thysanotus. 
Further, in the proportional lengths of the third and fourth segments of the 
second antenna, when compared with the second segment, it resembles aberdonen- 
sis T. and A. Seott (1892), and with this species is distinguished from others in 
the genus by this feature. It differs from elongatus in the genital segment and 
caudal rami, which are four times as long as wide in the latter. (The second an- 
tennae have not been described for elongatus Wilson (1937) ). 
“SaPHIRELLA”’ and ‘‘ PAUROCOPE’’ 
It appears to be a characteristic feature of the members of the Clausidiidae that 
some of the mouth parts show very little, if any, alteration during the post-larval 
development. Canu (fide Embleton, op. cit., p. 219) found that the mouth parts 
are not altered by the various moults, and Embleton states for Goidelia japonica 
that ‘‘The form of the mandible... is constant for the adult and immature 
stages of both sexes’? and that the maxillules are ‘‘alike in all stages and both 
sexes.’’ In Goidelia, unlike the other members of the family, both the maxilla 
