HYPERIDEA. 937 



Plate 67, fig. 11 a, animal, enlarged; b, front view of head ; c, infe- 

 rior antennae ; d, extremity of leg of seventh pair, from New Zealand 

 specimen. 



In the Pacific, latitude 41° south, longitude 76° 25' west. Collected 

 several specimens, April 5, 1839, some of which were in the water- 

 cavity of Salpas ; also between New Zealand and New Holland. 



Length, three to four lines. Colour, mostly dirty purple, with pur- 

 plish red in basal joints of legs. 



The seven thoracic segments about equal. First three abdominal 

 segments with the posterior angle on either side of each, prominent 

 and acute. In front view of the head, the antennary area is large, 

 nearly square, and the pigment occupies nearly all the space on the 

 side of it. This pigment was black. 



The inferior antennae have two short basal joints, and then a long, 

 compressed, subulate joint, which is a little hairy. 



The four anterior legs have the last three joints, or the terminal 

 portion straight, and apparently admitting of upward flexion alone ; 

 they terminate in a nearly straight spine. 



While swimming, the legs are generally folded up across the venter; 

 it swims by means of the abdominal legs, and the extremity of the 

 abdomen. 



Hyperia trigona. 



Corpus vdlde compressum, dorso acie instructo. Antennas capite lon- 

 giores, lmce subulatce, 2dce longoe (segmentum thoracis ^tum fere attin- 

 gentes), gracillimce, flagello inconspicud articulato. Pedes brevissirne 

 setulosi, 6 posticis longis, subwquis, 7 mis parce brevioribus, articulo Ato 

 Stiorum ^.torumve lato. 



Body very much compressed, the back rising to an edge. Antennae 

 longer than the head ; superior pair subulate, inferior long (reaching 

 nearly to fourth thoracic segment), very slender, flagellum indis- 

 tinctly jointed. Feet very short setulose ; six posterior pairs long 

 and subequal, the seventh pair a little the shortest ; fourth joint of 

 third or fourth pair rather broad. 



