CYCLOPOIDEA. 



AcARTIA LAXA. 



1123 



Gracilis. Frons rotundatus. Cephalothorax i-articulatus, capite nan 

 discrete-, posticd fongd acutus. Antennae anticce rectiusculce usque ad 

 basin, corpore paulo lo?igiores, nusquam /route anteriores, multiarticu- 

 latce, articulo primo longiore, setis longiusculis, valde incequis. Abdo- 

 men breve. Styli caudales paidum oblangi, setis latissimd divaricatis, 

 abdomine non longioribus* 



Slender. Front rounded. Cephalothorax four-jointed, head not sepa- 

 rate, long acute behind. Anterior antennae a little longer than the 

 body, nearly straight even from the base, tips not anterior to the 

 front, many-jointed, first joint longest ; setae of moderate length, the 

 longest about one-fourth as long as the antenna, others quite short, 

 the apical rather long. Abdomen short, three-jointed. Stylets 

 small, a little oblong, setae very widely spreading, not longer than 

 the abdomen. 



Plate 79, ^g. 5 a, animal, enlarged ; b, outline of head, showing the 

 superior eyes, and the two lenses with the pigment of the inferior eyes 

 directly below ; c, posterior thoracic appendages. 



Several specimens were collected in the Sooloo Archipelago, Feb- 

 ruary 2, 1842 ; also, in the Straits of Banca, March 2, 1842. 



Length, one-fifteenth of an inch. Colour, bluish. 



The anterior antennas have a lax appearance, owing to a slight 

 irregularity of direction, and the position and inequality of the setae. 

 They are in the same straight line nearly, even from the base. The 

 first joint of the antennae (or the first observed) is as long as the next 

 four joints; the longer apical setae about equal in length the last six 

 joints. The thorax behind has a slender spiniform prolongation on 

 either side. The caudal setae are so widely spread, that the flabellum 

 they constitute is much broader than long. The second pair of 

 antennae has the branches very unequal, the shorter and its setae 

 together but little exceeding in length the longer without its setae. 

 The eyes are situated quite close to the front, and the mass of pig- 



