



HYPERIDEA. gg^ 



rior abdominal segments are quite large, and are much prolonged on 

 either side, and the following are successively and rapidly smaller. 

 There is a small seventh segment at the extremity. The six caudal 

 stylets are very slender, more as in the Gammaridae than in most 

 Hyperidae. 



The inferior antennae are the longest in the species examined. The 

 superior have a short appendage to base. The bases in each pair are 

 rather slender, and the flagellum terete and multiarticulate. 



The legs from the second pair to the seventh inclusive have a 

 branchial sac and a fouette. The first pair terminates in an imper- 

 fect hand of small size. The second pair is vergiform, and has a few 

 longish setae at apex; the fourth joint is furnished on the under 

 side with rather long bent setae, and appear as if they served for 

 prehension in some way, in connexion with the terminal part of the 

 leg. The third pair is smaller than the fourth, and is hardly prehen- 

 sile. The fourth has the third and fourth joints broad, and the 

 fourth seems to act as a hand, the fifth and a minute claw consti- 

 tuting a finger. The six posterior legs are vergiform and have broad 

 coxae. 



The species are of a bright purplish blue colour, or nearly colour- 

 less. They occur sparingly in the tropical part of both the Pacific 

 and Atlantic Oceans. 



Stnopia ultramarina. 



Caput compressum, anticb triangidatum, lateribus capitis ad frontem 

 inter sese divaricatis 50°-60°. Antennce Imos dimidio breviores, fla- 

 gello ad basin setoso; 2do3 fere corporis longitudine. Pedes 8 antici 

 infra ciliati; primi minores, articulo tertio parvulo, ito lato et ob- 

 longo, rnanu breviter obovatd; secundi tenues, setis duabus longi- 

 usculis confecti; quarti crassiusculi et tertiis crassiores, articulo quarto 

 lato, patdo oblongo, ad apicem obliquo, digito brevi; 6 postici subosqui, 

 remote breviter setigeri, coxis paris quinti sextive latis, subrotwidatis, 

 paris septimi angustioribus et postici ad apicem triangulate productis 

 et subacutis. Styli caudales tenues, 2di breviores. 



Body compressed, triangulate in front, sides of the head diverging at 

 an angle of 50° or 60°. Superior antennae half the shorter, flagel- 



