292 



U.S. NATIONAL MUSEUM BULLETIN 271 



outer ramus of uropod 3 with an elongated article 1 of the mandibular 

 l)alp. Eiisirella and Eiisiropsis are the only eusirids having an obsoles- 

 cent mandibular molar and they are clearly eusirids for their possession 

 of calceoli. Eusirids have the outer ramus of uropods 1 and 2 shortened; 

 in liljeborgiids this shortening is slightly evident only on uropod 2. 

 One genus of Amphilochidae, Pseudamphilochiis, bears resemblance 

 to Liljeborgiidae for its unreduced coxa 1, cleft telson, weak mandi- 

 bular molar, and moderately powerful gnathopods. Pseudamphilochus 

 presumably lacks an accessory flagellum, has a large rostrum, and 

 nonbifid apices of the telson. 



Figure 115.— Liljeborgiidae: a, Liljeborgia brevicornis (Bruzelius) (Sars, 1895, pi. 187, 

 as L. pallida); b, Idunella aequicornis (Sars, 1895, pi. 190). 



