74 G. O. Sars. 



Bay, near Waterworks Bridge. A rather considerable num- 

 ber of specimens of the same species were, moreover, picked 

 up from a sample taken by that gentleman from ponds at 

 Bourke Street and the Waterloo Swamps. 



Xrib. Cyclopoidea Fam. Oyclopidæ. 



Gen. Cyclops, Müll. 



37. Cyclops australis, King. 



Specific Characters.— ¥ Body moderately slender, 

 with the anterior division oblong oval, tapering somewhat 

 posteriorly; none of the segments extant laterally. Tail 

 about 2 /3 as long as the anterior division, genital segment 

 not attaining the length of the 3 succeeding segments com- 

 bined, and moderately dilated in front. Caudal rami narrow, 

 linear, not diverging, exceeding in length the last 2 seg- 

 ments combined, innermost apical setæ a little longer than the 

 outmost, both being much shorter than the 2 median ones, 

 bristle of the outer edge not far remote from the tip. 

 Anterior antennæ scarcely exceeding in length the 1st seg- 

 ment of the body, and 12-articulate, 8th and 9th joints 

 rather large. First pair of legs with both rami Particulate, 

 the 3 succeeding pairs with 3-articulate rami of normal 

 structure; 4th pair with the outer apical spine of the inner 

 ramus nearly as long as the inner. 5th pair of legs very 

 rudimentary, the basal joint not being defined from the 

 segment, though carrying the usual seta, terminal joint very 

 minute, with a comparatively short apical seta and an extremely 

 small lateral denticle. Length of adult female 2.20 mm. 



