CYCLOPOIDEA. 



1183 



8etis incequalibus, posterioribus articulorum penultimi et prceantepe- 

 nultimi longioribus (quatuor articulos ultirnos simul surntos longitudine 

 cequantibus), anterioribus perbrevibus. Styli caudales prcelongi, dimi- 

 dio abdomine vix brevwres, setis brevibus, secundd tertidque subcequis et 

 stylo paulo longioribus. 



Female: — Naked. Cephalothorax having the posterior angles obtuse, 

 much longer than the abdomen. Anterior antennge two-thirds the 

 length of the cephalothorax, thirteen- or fourteen-jointed, joints 

 short, five basal not oblong ; setae of antennas quite unequal, the 

 posterior of the penult and praeantepenult joints longest, equalling 

 the last four joints together in length, anterior of same joints very 

 short. Caudal stylets very long, nearly equalling half the abdo- 

 men, setae short, the second and third nearly equal and slightly 

 longer than the stylets. 



Plate 83, fig. 2 a, female, enlarged; b, extremity of antennae; c, 

 extremity of posterior antennae ; d, extremity of maxillipeds. 



Brackish water, Valparaiso, May, 1839. 



Length, one-twentieth of an inch. Second pair of antennae quite 

 slender. Maxillipeds have a finger-like joint at apex, terminating in 

 three or four setae, and the preceding joint is largest near apex, with 

 the inner margin setulose. Anterior pair of natatory legs a little the 

 smallest. External ovarian sacs oblong, purple ; nine or ten eggs in 

 each, in the specimens examined. 



Cyclops pubescens. 



Cephalotliorax pubescens, abdominem longitudine vix superans, posticd 

 subacutus. Antennae anticw feminae dimidii cephaloihoracis longi- 

 tudine, 8— 9 -articulate, setis totis brevibus; maris breviwes, tribus 

 articulis basalibus perbrevibus, quarto crassissimo subovato, dimidii 

 antennas longitudine, ultimo (forsan duplice) tenui brevique, digiti- 

 formi. Styli caudales abdomine quadruplo breviores; seta secundd 

 abdomine longiore, 'prima brevissimd. 



Cephalothorax pubescent, but slightly longer than abdomen, subacute 



