
NICHOLLS—COPEPODA FROM SOUTH AUSTRALIA 55 
6. Fourth endopod with marked notch at about centre; caudal rami six times as long as wide 
gracilis Claus 1889. 
Fourth endopod with slight notch at centre and proximal bulge; caudal rami five times as 
long as wide 48 weberi A. Scott 1909, 
Fourth endopod without noteh, but with slight proximal bulge; caudal rami four to four- 
and-one-half times as long as wide ae nemertophilus Gallien 1935, 
7. Last two segments of urosome subequal .. oi 2% . 8 
Anal segment at least twice as long as pre-anal .. thorelli (Brady and Robertson) 1875. 
8. Caudal rami about as long as last two segments of urosome together dubius Sars 1918. 
Caudal rami about as long as last three segments of urosome together 
concinnus Thompson and Scott 1903. 
PSEUDANTHESSIUS TENUIS sp. nov. 
Occurrence. IX, 1 female. 
Female. Length 0-66 mm. Body of usual shape in the genus, with the genital 
segment distinctly dilated anteriorly, bearing a pair of pointed postero-lateral 

Fig. 25. Pseudanthessius tenuis sp.nov. Female X 80; urosome and appendages x 240. 
projections dorsally at about the centre and a pair of rounded projections vent- 
rally, just behind the dorsal projections. The anal segment is longer than the 
pre-anal, but not as long as the caudal rami, which are distinctly more than twice 
as long as wide. The first antenna is 7-segmented and of normal appearance; the 
