CYCLOPOIDEA. 1259 



iridescence. The cephalothorax is broadest at posterior part of first 

 segment, where there is an imperfect angle in the outline. The penult 

 segment is rounded on either side behind, and the last is nearly 

 truncate ; these last two are of nearly equal length, and each is 

 about half shorter than either of the two preceding. 



Sapphipjna obtusa. 



Lamellce caudales elongatce, non divaricatw, setis dimidio lamellce valde 

 brevioribus. Feminae : — Cephalothorax convexus, A-articulatus, ad 

 frontem subtruncatus, segmento antico oblongo, lateribus fere parallelis 

 angidis posticis rotundatis, segmentis aliis dissimilibus, secundo latere 

 truncate, tertio rotundato, quarto (vel ultimo) ad medium lateris angidato. 

 Conspicilla fronte insita, parce remotiuscula. Abdomen angustum, 5- 

 articidatum f segmento primo parvulo, tribus sequentibus sublunatis, 

 lateribus obtusis. 



Caudal lamellae oblong, not divaricate, setae quite short, much shorter 

 than half the lamellae. Female: — Cephalothorax convex, elongate, 

 about twice as long as broad, four-jointed, subtruncate in front, seg- 

 ments laterally rounded, anterior oblong, not narrow behind, obtuse, 

 second truncate either side, third rounded, fourth or last angulate on 

 either side at middle, and rounded at the posterior angles. Conspicilla 

 situated on the front, nearly in contact. Abdomen narrow, five- 

 jointed, first segment quite narrow and small, three following sub- 

 lunate, sides elongate, obtuse. 



Plate 88, iig. 10, animal, enlarged. 



Pacific, latitude 43° south, longitude 78° 45' west, April 3, 1839. 



Length, one-fifteenth of an inch. Colour, reddish, with some yellow. 

 The legs are often seen, in an upper view, projecting below and either 

 side of the basal portion of the abdomen. 



