1224 



CRUSTACEA. 



B. Seta articuli 2di antennarum jposticarum setulosa. [ Cephalothorax postice elonyatl 



acutusJ] 



CORYC^EUS PELLUCIDUS. 



Cephalothorax gracilis, ventre maximh carinato. Conspicilla fere con- 

 tigua. Antenna? anticas 7 -articulator, setis fere brevibus. Antennarum 

 posticarum articulus 2dus apicem internum acutus, digito brevi 

 Abdomen 1-articulatum, apice obliquh truncate. Styli caudales dimi- 

 dio abdominis longiores, setis vix majoribus. 



Cephalothorax slender, venter prominently carinate. Conspicilla 

 nearly contiguous, large. Anterior antennae seven-jointed, setae 

 rather short. Finger of the posterior antennas short, second joint 

 acute at the inner apex, and its setae long and setulose. Abdomen 

 one-jointed, posterior apex obliquely truncate and much excavate. 

 Caudal stylets longer than half the abdomen, setae scarcely longer 

 than the stylets. 



Plate 86, fig. 6 a, animal, enlarged ; b, dorsal view of abdomen ; c, 

 profile of cephalothorax, showing carinate process below ; d, posterior 

 antennae. 



Atlantic, latitude 4°-7° north, longitude 19° 3CK-21 30 7 west, 

 October 18, 20, 22, 24, 26 ; also, latitude 2° 20' south, longitude 20° 

 west, November 6, 1838. 



Length, one-twenty-fifth of an inch. Colourless and pellucid, with 

 a little light blue in the cephalothorax and along the venter. 



The cephalothorax in the specimen examined was peculiarly slender 

 in a dorsal view, but this may not be a constant character. It was 

 broadest anteriorly. 



The abdomen in a lateral view has the upper and under sides 

 parallel, through the basal two-thirds ; after this the upper apex is 

 truncated, and at this spot there are two oblong oval laminae attached. 

 In an upper view, the outline of the abdomen is oblong elliptical. In 

 one specimen there were several appendages to the abdomen above, 

 instead of two, the usual number. 



