836 CRUSTACEA. 



dimidio breviores. Abdominis segmenta duo antica angidos posticos 

 acuta no?i truncata. 



Similar to G. gracilis. The two long antennas nearly as long as the 

 body, a little stouter than in the preceding, obsoletely multiarticu- 

 late. Seventh pair longer than half the fifth. Two anterior abdo- 

 minal segments with the posterior angles acute and not truncate. 



Plate 55, fig. 7 a, animal, enlarged, posterior stylets and one an- 

 tenna mutilated ; b, outline of front in vertical view. 



Pacific Ocean, latitude 18° 10' south, longitude 126° west. Col- 

 lected, August 8, 1839. 



Length, four to five lines. Colour of thorax, mostly brownish; of 

 abdomen, red, and part of antennas same colour. There is a promi- 

 nent angle on front of head and a low angle over each of the antennas; 

 but the front angle is not apparent in a vertical view, as the front 

 margin, which is in advance of the angle, is depressed below the upper 

 surface of the head. The eyes are as in the gracilis. In the second 

 and third pairs of legs the fourth joint is longer than either the fourth 

 or third. . A large oval lamella, branchial in character, is attached to 

 the base of several of the legs. The posterior angles of the first two 

 abdominal segments are acute, and the acute points occupy the poste- 

 rior part of the margin, instead of being in advance of it, as in the 

 gracilis. 



Subfamily COROPHIME. 

 Genus COROPHIUM, Latr. 

 COROPHIUM? QUADRICEPS. 



Corpus depressum, lineare, capite quadi'ato, abdomine postice rotundato. 

 Pedes 4 antici similes, primis minorbus. Pedes quinti quartis bre- 

 viores, articido primo non setoso ; septimi tenues, articulo primo setoso, 

 setis longiuscidis, plumosis. Antennas ad marginem posticum sub- 

 wquce; superiores parce b?*eviores, 1 -articulake, articulo primo lon- 

 giore; inferiores crassiusculo3, 7 ' -articulatce, quartam partem corporis 



