

2214 CRUSTACEA. 



B. Setce caudales stylis non valde breviores, scepe hngiores. 

 * Cephalothorax posticfe obtusus. 



CORYOEUS OBTUSUS. 



Conspicilla lata. Antennae anticce tenues, setis hngiusculis. Anten- 

 narum posticarum articulus 2dus digito non brevior, seta longd nudd. 

 Abdomen 2-artiadatum, sub bad apiculatum, segmento secundo dimi- 

 dium primi longitudine paulo superante. Styli caudales dimidii abdo- 

 minis longitudine, setis stylo parce longioribus. 



Conspicilla large. Anterior antennse slender, setae rather long. Fin- 

 ger of posterior antennas not longer than second joint, seta of second 

 joint long, naked. Abdomen two-jointed, produced into a tooth 

 below at base, second segment somewhat exceeding half the first in 

 length. Caudal stylets half as long as the abdomen, setae slightly 

 longer than the stylets. 



Plate 85, fig. 6, animal, enlarged, lateral view. 



Pacific Ocean, near El Gran Cocal, latitude 5&° south, longitude 

 175i° east, March 25, 1841. 



Length, one-thirtieth of an inch. 



In a lateral view, the abdomen is very narrow at base, and then 

 abruptly widens from below, and is prolonged into an acute curved 

 tooth ; it then narrows gradually. At the apex of the first segment 

 below, there are two or more very short setae. The stylets are quite 

 slender. The longest of the setae is about once and a half the stylets. 

 The posterior antennae are more than twice the size of the anterior 

 legs. 



f Cephalothorax postiofe acutus. 

 CORYCEUS CRASSIUSCULUS. 



Cephaloihorax crassiusculus, segmento quarto posticl subacuto. Conspi- 

 cilla contigua. Antennarum posticarum articulus 2dus digito vvx 



