CYCLOPOIDEA. 



1185 



the terminal one a little longer than the joint. Caudal stylets 

 slender, as long as last two abdominal segments, the second seta 

 shorter than the abdomen, the first not longer than the stylets. 



Plate 83, fig. 4 a, female, enlarged; b, extremity of antenna. 



Fresh-water pools, near Sydney, New South Wales, December, 1839. 



Length, one-twenty-fourth of an inch. Nearly colourless. Abdo- 

 men together with the caudal stylets nearly as long as the cephalo- 

 thorax. Antennae having the penult joint a little longer than the 

 apical or antepenult ; the longest seta at the apex of the anterior 

 antennae is but little longer than the apical joint; on antepenult joint, 

 the posterior seta is longer than the anterior, but does not exceed the 

 length of the joint. External ovarian sacs longer than abdomen, not 

 divergent in position. 



Cyclops vitiensis. 



Feminae : — Cephalothorax posticd fere obtusus, abdominem longitudine 

 vix superans, niidus. Antennae anticce longce, ceplialoihoracis longitu- 

 dine, multiarticulatce ; articulo primo crasso, oblongo, secundo dimidio 

 rriinore, 6 sequentibus perbrevibus ; setts antennarum incequalibus, arti- 

 culorum primi secundique paulo longioribus, ultimi et 3 subultimorum 

 posterioribus subcequalibus, articulo penultimo paulo longioribus, setis 

 anterioribus articulorum subultimorum perbrevibus. Styli oblongi, vix 

 duorum articulorum abdominis longitudine; seta secundd abdomine 

 paulo longiore. 



Female: — Cephalothorax rather obtuse at the posterior angles, but 

 little longer than the abdomen, naked. Anterior antennae as long 

 as the cephalothorax, multiarticulate, first joint stout, oblong, the 

 second one half smaller than the first, the six following very short; 

 setae of anterior antennae unequal, of first and second joints elon- 

 gate, of the last and the posterior of the three subultimate subequal, 

 and rather longer than the joint to which attached ; anterior setae 

 of same joints very short. Stylets oblong, scarcely as long as two 

 abdominal segments together, second seta a little longer than the 



abdomen. 



297 



