2220 CRUSTACEA. 



one-third the length of the stylets ; the stylets are very long, and were 

 not divergent in the specimen seen. 



b. Digitus antennarum posticarum articulo 2do valde brevior, uncinatm. 



CORYC^EUS SPECIOSUS. 



Cephalothorax ad segmentum quartum elongate acntus. Conspicilla non 

 contigua. Antennae anticae setis longissimis. Abdomen 2-articulatum 9 

 articulo primo crasso, secundo cylindrico et dimidio breviore. Styli 

 caudales abdomine longiores, divaricati, setis brevibus. [Pedes Mremes 

 4 posteriores utrinque protensi.'] 



Cephalothorax with the fourth segment acute behind. Conspicilla 

 not in contact. Anterior antennae seven-jointed, setae very long. 

 Abdomen two-jointed, first segment stout, the second half shorter, 

 cylindrical. Caudal stylets longer than abdomen, divaricate, setae 

 short. [Four posterior natatory feet extended laterally.] 



Plate 86, fig. 1 a, animal, enlarged ; b, abdomen, in lateral view ; c, 

 one of the natatories of the second pair ; d, same, third pair. 



Atlantic, latitude 5°-7° north, longitude 21°-22° west, October 20 

 and 22, 1838. 



Length, one-sixteenth of an inch. Specimen of October 22, colour- 

 less, except a bright red spot near middle of cephalothorax ; that of 

 October 20, having the four posterior natatories of a deep orange, and 

 the antennae with the stout part of the abdomen of the same colour. 



This species is remarkable for the lateral extension of the two 

 posterior pairs of natatories, w T hich when coloured give a beautiful 

 appearance to the little animal. The setae of the anterior antennae 

 are somewhat longer than the organ. The finger of the posterior 

 antennae is a short claw. The abdomen is enlarged posterior to the 

 middle of the first segment, and above, upon this enlarged part, there 

 is some appearance of an aperture. The branches of the natatories 

 are both three-jointed. 



