47(i BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



of five articles. The palp of the iiiandi})le.s is composed of three 

 articles. 



Tlie first seg-ment of the thorax has the post-lateral lobes large and 

 prominent; the antero-lateral lobes are obsolete, but small epimeral 

 lobes, one on either side, are conspicuous at the antero-lateral angles 



of the segment. The second, 

 third, and fourth segments 

 have eacli a conspicuous l)ut 

 small antero-lateral lobe on 

 either side, produced beyond 

 the large post-lateral portion 

 of the segment, and between 

 the anterior and posterior 

 lol)es is the small but conspic- 

 uous epimeral lobe. The last 

 three segments have a larg-e 

 antero-lateral lobe, with the 

 post-lateral lobe obsolete, and 

 the small epimeral lobe situ- 

 ated at the post-lateral angles. 

 The abdomen is composed 

 of a single large segment, the 

 post-lateral angles of which 

 are widely rounded, and the 

 posterior margin has a prom- 

 inent rounded median lobe. 

 The posterior half of the lat- 

 eral margins and the luargins 

 of the ])ost- lateral angles are strongly serrate. The uropoda are about 

 one and a fourth times longer than the abdomen. The peduncle is as 

 long as two-thirds the length of the abdomen. The outer branch is as 

 long as the peduncle. The inner branch is one and a half times the 

 length of the outer brand i. 



The first pair of legs are prehensile, but are not longer than the 

 others. The six following pairs are ambulatory with l)i-unguiculate 

 dactyli. 



76. Genus JyEROPSIS Kcehler. 



Eyes present. Both pairs of antennae extremely small; flagellum of 

 first pair ()l)solete; flagellum of second pair rudimentary. Articles 

 of peduncl(> of second antennte dilated. p43ignatli of maxillipeds nar- 

 row, produced to a tapering extremity. Apex of mandibles produced 

 in five teeth. 



Segments of thorax separated at the sides, not forming an unbroken 

 continuous lateral line. 



Fig. 532.— Janira alta. a, Abdomen with uropoda. 

 X 15}. 6, Maxilliped. ;< 51|. c, First leg. x 27}. 

 d, Mandible, x 51§. 



