476 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



of five articles. The palp of the mandibles is composed of three 



articles. 



The first segment 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 each a conspicuous but 

 small antero-lateral lobe on 

 either side, produced beyond 

 the large post-lateral portion 

 of the segment, and between 

 the anterior and posterior 

 lobes is the small but conspic- 

 uous epimeral lobe. The last 

 three segments have a large 

 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- 



FIG. 532. JANIRA ALTA. a, ABDOMEN WITH UROPODA. inent rounded median lobe. 

 x 15| . b, MAXILLIPED. x 51|. c, FIRST LEG. x 27|. rpi^ :^ M u i* t \ i * 



d, MANDIBLE, x 5i|. The posterior half of the lat- 



eral margins and the margins 



of the post-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 branch. 



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

 others. The six following pairs are ambulatory with bi-unguiculate 

 dactyli. 



76. Genus J^EROPSIS Koehler. 



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

 first pair obsolete; flagellum of second pair rudimentary. Articles 

 of peduncle of second antennae dilated. Epignath 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. 



