6X0 CRUSTACEA. 



Stii et pedes lmi formd consimiles, sensim increscentes, articulo pemd- 

 tirno angustd oblongo, digito plus dimidio breviore quam articulus pre- 

 cedens. Pedes reliqui graeillimi, crin/lti, palpo longo, natatorio. 



Carapax low rounded in front, posterior margin profoundly excavate. 

 Penult segment of abdomen longer than the last, the last subulate, 

 hardly longer than caudal laminae, which are equal. Inner antennae 

 a little shorter than outer, half as long as body, one flagellum quite 

 short (about one-third the longer) ; basal scale of outer antennae 

 much longer than base of inner antennae. Second and third pairs 

 of maxillipeds and first pair of feet enlarging regularly, and termi- 

 nating alike in a narrow oblong monodactyl hand, the finger un- 

 guiform, not half as long as hand. Following feet very slender, 

 crinite, palpus long and natatory. 



Plate 40, fig. 10 a, animal, enlarged ; b, inner antennae ; c, outer 

 antennae ; d, under view of mouth ; e, mandible ; /, first pair of max- 

 illae ; g, second maxillae ; h, first legs (or second pair of maxillipeds) ; 

 i, second legs ; k, third pair ; I, one of posterior pairs of legs ; in, first 

 pair of abdominal appendages. 



Antarctic Seas, latitude 66° 12' south, longitude 149° 44' east, 

 south of New Holland ; taken from the stomach of a Penguin. 



Length, one inch. Carapax without a trace of a beak, but nearly 

 semicircular in front, the semicircle terminating either side over the 

 bases of the eyes. The sides behind are much prolonged and rounded, 

 extending nearly to second abdominal segment, while the deep dorsal 

 excavation exposes to view the last thoracic segment and part of the 

 preceding. Thorax scarcely compressed. Fourth abdominal segment 

 longer than the one preceding or following; sixth as long as fourth 

 and fifth, and longer than seventh; seventh narrow, and gradually 

 narrowing to a point, entire, lateral appendages of same length, inner 

 lanceolate and obtuse, outer rounded at apex, margins ciliate, except 

 outer margin of outer lamella. 



Eyes with cylindrical pedicels, rather small. 



Base of superior antennae three-jointed, rather stout, hairy on inner 

 side, the second joint quite short, third with inner apex a little pro- 

 longed, and bearing from this apex a very slender short flagellum, 

 consisting of oblong joints. The fourth joint, which may be con- 



