
NICHOLLS—COPEPODA FROM SOUTH AUSTRALIA 5. 
Sars asserts that there should be only three segments in the urosome in the female, 
in conformity with ‘‘all other fresh-water Calanoida’’; the first antenna of the 
female should have only 25 segments; the exopod of the first lee should have 
three segments; and, finally, in Smith’s description the right and left fifth legs 
of the male have been confused. The species found here and deseribed below sup- 
ports Sars’ statements in every respect. 
Seven species have been described in this genus(1), keys to both sexes of which 
are given below. Making allowance for the errors in Smith’s description renders 
it difficult to separate tasmanica from longicornis Searle, which Sars described in 
full. He admits the similarity between the two species, and states that longicornis 
‘is of smaller size and still more slender form of the body, differing moreover in 
the greater length of the anterior antennae.’’ The females of these two species 
and of steele are all very similar, the species being most easily distinguished by 
their respective males. 
The occurrence of the present species from a salt lake appears to be the first 
occasion on which the genus has been recorded from any but fresh water. 
Kery To THE FEMALES. 
1. Last thoracic segment with rounded postero-lateral corners MH 2. 
Last thoracic segment with pointed lateral projections, sometimes expanded into wings 5. 
2. Fifth endopod 2-segmented .. se a a tle he, Be 
Fifth endopod l-segmented .. ve . +s ampulla Searle 1911, 
3. Caudal rami not more than four times as long as wide aug steelt Henry 1924. 
Caudal rami at least five times as long as wide . + oe 4 
4, First antenna extending beyond caudal rami by its last three segments 
longicornis Searle 1912. 
First antenna scarcely reaching end of caudal rami .. a tasmanica Smith 1909. 
5. Fifth endopod 2-segmented .. - as os ae as ©. 
Fifth endopod 1l-segmented .. ble fit $a -. salina sp. nov. 
6. Second segment of fifth exopod with small outer process or pie opposite the large inner 
This segment with outer distal corner rounded, unarmed et australis Searle “iol. 
7. End segment of fifth endopod with 1 inner and 4 sub-terminal setae viridis Searle 1911. 
End segment of fifth endopod with 2 inner, 2 terminal and 2 outer setae  expansa Sars 1912. 
It has not been deemed advisable to employ the three-segmented first exopod 
described for steeli in the construction of this key, as in the new species described 
here this exopod is three-segmented, but the segmentation is not very distinct. It 
is possible that this ramus is subject to variation particularly as the outer spines, 
which normally indicate the point of segmentation, are absent from this leg. 
It is of interest to note that the outer spine is missing also from the proximal 
segment in all the legs. That the swimming legs are somewhat variable is shown 
by the variation in armature described for salina (infra). 
As far as can be ascertained all the species so far described have been taken 
from fresh water. This is the first record of a species occurring in a salt lake. 
Key To THE MALES. 
This key is based entirely on the structure of the fifth legs. 
1. Right endopod 3-segmented .. os .- A 4. oe 8 
Right endopod 2-segmented .. “13 oa te fe os 5 
Right endopod 1-segmented .. o +4 34 ampulla Searle 1911. 

(4) Since this account was written two more species have been described from Western Aus- 
tralia, by W. 8. Fairbridge (Journ. Roy. Soc., West. Aust., xxix, in press). 
