CYCLOPOIDEA. 



EuCHjETA DIADEMA. 



1091 



Feminae: — Cephalothorax pubescens, capite lateraliter angulatus, i-arti- 

 culatus, postice obtusus. Antennce anticcefere corporis longitudine, quoad 

 setas E. communi fere similes, setd posticd penultimd dimidium posticce 

 apicalis superante, setis antepenidtimis brevissimis. Pedes antici apice 

 5-7-articulati et perbreves. Abdomen elongatum, segmento primo secun- 

 dum longitudine paulo superante. Seta caudalis secunda corpore lon- 

 gior, nuda. 



Female: — Cephalothorax obtuse behind, pubescent, front on either 

 side and at middle acute, four-jointed, a fifth behind sometimes 

 apparent. Anterior antennae almost as long as body, the setse 

 nearly as in the communis, posterior penult seta longer than half 

 the posterior apical, antepenult setae very short. Anterior feet 

 having the apical jointed portion rather short, the long setse seven 

 in number. Abdomen elongate, four-jointed, the first segment oblong, 

 a little exceeding the second in length. Caudal setse straight, the 

 second longer than the body, naked. 



Plate 77, fig. 7 a, animal, enlarged; b, maxillipeds ; c, anterior feet; 

 d, posterior thoracic feet of female ; e, an appendage attached below to 

 abdomen near its base in some individuals. 



Collected in the Pacific, March 23, 24, and 25, 1841, south of and 

 near the Kingsmill Islands, latitude 6°-6° 30' south, longitude 175° 

 30'-177° east. 



Length, one-seventh of an inch. Colour, yellowish, or reddish; 

 also, colourless. 



This species is near the preceding, but is different in having the 

 long caudal setas naked instead of plumose, and also in its anterior 

 feet, and in the maxillipeds being much smaller in proportion. In 

 the organs last mentioned, the setae are not longer than the leg, while 

 in the pubescens they are much longer. The abdomen varies some- 

 what, and although about half the length of the cephalothorax in the 



