J218 CRUSTACEA. 



ceding, and very slender. In a side view, the upper outline of the 

 abdomen is nearly straight; the lower has a notch where the abdo- 

 men near middle diminishes in breadth ; there are short setae at this 

 spot. The posterior antennae have two naked setae to second joint 

 according to my description ; in the figure there is but one represented. 



CORYCEUS ORIENTALIS. 



Cephalothorax crassus, segmento quarto rectangulato, subacute. Conspi- 

 cilia parva, remota. Antennas anticce breviter setulosaz. Antennarum 

 posticarum articulus 2dus digito paulo longior, seta longd, nudd, 

 digito articulis duobus suhoequis composito. Abdomen 2-artlculatum y 

 ad apicem vix productum, ad basin infra rectangulatum. Slyli cau- 

 dales breves, setis parce longioribus. 



Cephalothorax stout, fourth segment rectangular, subacute. Conspi- 

 cilla small, remote. Anterior antennae with short setae. Finger 

 of the posterior antennae scarcely shorter than the second joint, its 

 two joints subequal ; seta of second joint long, naked. Abdomen 

 elliptical, apex scarcely prolonged, below at base rectangular in pro- 

 file. Caudal stylets short, setae but slightly longer. 



Plate 85, fig. 11a, animal, enlarged; b, dorsal view; c, posterior 

 antenna. 



Sooloo Sea, southwest of Panay, January 29, 1842 ; also, among 

 the Sooloo Islands, February 2, 1842. 



Length, one-twentieth of an inch. Nearly colourless, with red 

 about the mouth and venter, and in the abdomen. 



Cephalothorax in dorsal view elliptical. The conspicilla are 

 remarkably small and distant. The abdomen is two-jointed, the 

 second less than half the length of the first; the whole elliptical, 

 apically a little prolonged, but not having a cylindrical apex. In 

 profile the abdomen is broadest at base and tapers to apex, the lower 

 side being however straight, and having a right angle at base. The 

 stylets are less than half the length of the abdomen, and the setae do 

 not exceed half the abdomen. 



