CYCLOPOIDEA. ;Q21 



ACARTIA NEGLIGENS. 



Graclllima. Frons triangulatus. Cephalothorax angustus, posticd minuti 

 apicidatus, capite fere discrete. Antennae anticce fere corporis longi- 

 tudine, tenuissimce, latissimS divaricatce, apicibus fronte paulo ante- 

 rioi'ibus, 7- 9 -articulates, articidis trifais ultirnis brevibus : setis prce- 

 longis, posticd penultimd apicales oequante. Styli caudales tenuissimi, 

 oblongi, setis lat& divaricatis. 



More slender than the limpida. Front obtusely triangular. Cephalo- 

 thorax narrow, obtuse behind but having a very minute point, the 

 head faintly separated. Anterior antenn£e nearly as long as the 

 body, very slender, very widely divaricate, tips a little anterior to 

 the beak, seven- to nine-jointed, last three joints short, setaB very 

 long, the apical long, the penult anterior quite short, posterior 

 penult as long as the apical, antepenult very short. Caudal stylets 

 very slender oblong, setae much spreading. 



Plate 79, iig. 3 a, animal, enlarged ; b, posterior part of body, in 

 profile, the caudal setae removed, enlarged ; c, second pair of antennae, 

 more enlarged. 



Pacific, near Hopper Island, Kingsmill Group, latitude 0° 30' north, 

 longitude 174° east, April 15, 1841; also, May 17, 1841, in latitude 

 27*° north, longitude 171° east. 



Length, one-tenth of an inch. Colourless. 



This species resembles the preceding, but is more slender. The 

 antennae are thrown less forward, the two being nearly in the same 

 straight line; the third joint from the extremity is the shortest; 

 the preceding are long and slender. In one or two of the long joints 

 there are appearances of an articulation, but so faint as to be quite 

 uncertain. The setae of the antennae are in general above one-third 

 the length of these organs; the seta at the posterior apex of the 

 penult joint is of the same length ; those of the antepenult joint are 

 not longer than the joint. The short spine at either posterior angle 

 of the cephalothorax is seen only under a high magnifying power. 



281 



