184 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



second; the fourth is twice as long as the third; the fifth is a little 

 shorter than the fourth. The flagelluni is composed of eighteen 

 articles. The second pair of antennae extend to the posterior margin 

 of the third thoracic segment. The frontal lamina or inter-antennal 

 plate is about twice as broad as long, transversely placed, has the 

 base somewhat oval in shape and directed anteriorly. The maxilliped 

 has a palp of Hve articles. 



The segments of the thorax are of nearly equal length, the lirst seg- 

 ment being a little longer and the seventh a little shorter than any of 

 the others. The epimera are very distinctly separated on all the seg- 

 ments. They are broad plates, with very acute post-lateral angles, 

 which in the last three epimera are produced beyond the posterior 



margin of the segment. There 

 '^ is a carina on all the epimera 



which extends from the post- 

 ^HV^-'^-Z^^^"^. ^~^^^^ lateral ano-le to the middle of 



// 



Fig. 1G7.— .EGA GRACILIPES (AFTER HANSEN), f!. 



Frontal part of head from under.side. 6, Gen- 

 eral FIGURE. (Enlarged.) 



Fig. 168.— ^ga GRACILIPES. a, Maxilliped, 

 X 27j. h. Leg of second pair, x 9i. 



the side adjacent to the segment in the last three and to the inner 

 antero-lateral angle in the first two; in the third epimera it extends to 

 a point about halfway ])etween the middle of the side adjacent to the 

 segment and the inner antero-lateral angle. 



All six segments of the abdomen are distinct, the first one being 

 partly covered in the middle of the dorsal surface by the seventh tho- 

 racic segment. The lateral jjarts of the segments are not distinct from 

 the dorsal portion. The sixth or terminal segment is broadly rounded 

 at the sides with the posterior margin produced in the middle in an 

 acute point. On cither side of the median point the margin is den- 

 ticulate and furnished with about five spines. The uropoda extend to 

 the tip of the terminal segment. The branches are equal in length, 



