CYCLOPOIDEA. ^249 



vexum. Ceplialoihorax ellipticus, 5-articulatus. Conspicilla fronte 

 insita. Abdomen Q-articulatum, segmento primo parvido, tertio quarto 

 quintoque lunatis. 



Finger of posterior antennae slender, nearly as long as second joint, 

 claw about half as long as finger. Caudal lamellae subovate, inner 

 apex hardly prominent, setae four, two apical, the others external, 

 all a little exceeding half the lamellae in length. Female: — Body 

 very convex. Cephalothorax oval, five-jointed, first articulation 

 obsolete, posterior segment obtuse on either side. Conspicilla of 

 moderate size, situated on the front. Abdomen oblong, six-jointed, 

 first segment small, third, fourth, fifth lunate. 



Plate 87, ^g. 12 a, animal, enlarged; b, posterior antenna. 



North Pacific Ocean, latitude 28° north, longitude 177° east, May 

 20, 1841. % 



Length, about one-sixteenth of an inch. Opaque. Colour, deep 

 blue, with rich ultramarine reflections. 



The first segment of the cephalothorax, which is separated from 

 the second by an obsolete articulation, is not quite as long as broad. 

 The first abdominal segment is very short, and bears appendages. 

 Caudal lamellae subovate, as usual. 



Sapphipjna orientalis. 



Digitus antennarum posticarum tenuis, ferine articuli 2di longitudine, 

 unguiculo minus dimidio digiti. Lamellae caudales breviter ovatce, 

 prope apicem internum dente acuto armatm, setis quatuor, duabus 

 apicalibus, aliis externis, totis brevibus, vix dimidii lamellce longitu- 

 dine. Maris: — Corpus valde depressum, subovatum, 10-articulatum, 

 segmento antico latiore et paulo transverso, aliis sensim angustioribus. 

 Conspicilla fronte insita. Feminae (?) :— Corpus coiwexum. Cepha- 

 lothorax ellipticus, h-articulatus, segmento antico non transverso, postico 

 ad latera truncate, angulis posticis acutis. Conspicilla fronte insita. 

 Abdomen 6-articulatum, segmento primo minore, lateribus truncatis, 

 secundo lateribus rotundatis, tribus sequentibus lunatis. 



313 



