GAMMARIDEAN AMPHIPODA 181 



cutting edge with a deep incision delineating a lateral boss, molar 

 medially located, small, projecting, subcorneal, setulose, palp attached 

 distinctly but not greatly proximal to molar, article 1 not elongated, 

 half as long as article 3; inner plate of maxilla 1 bearing 2 terminal 

 setae, outer plate with essentially 2 types of spines, one large serrated 

 kind, one smaller kind with bifid or trifid apices (but not as small as 

 in Arugella); lobes of maxilla 2 subequal in breadth; article 4 of 

 maxillipedal palp about 40% as long as article 3; gnathopod 2 with 

 slightly chelate palm; coxa 1 very broad, partially concealing mouth- 

 parts, expanded distally; uropod 2 with constricted inner ramus; 

 uropod 3 stout, short, peduncle apparently subequal to telson, lamelli- 

 form laterally, rami slender, not longer than peduncle; telson lingui- 

 form, entire, apex convex. 



Until Hurley (1963) submerged Aruga and Shoemakerella, the 

 genus Lysianopsis was monotypic. Aruga differed from it only by the 

 elongated second antennae of the male and Shoemakerella primarily 

 by the flabellate inner lobe of maxilla 2. 



Diagnosis of Aruga oculata Holmes (1908). — Article 2 but not 

 article 3 of antenna 1 extraordinarily long for the family Lysianassidae 

 (both articles 2-3 elongated in the other genera related to Lysianassa) ; 

 upper lip forming a linguiform lobe projecting in front of epistome; 

 mandibular cutting edge with accessory lobe not conspicuously set 

 off by incision, molar moderately large, setulose, palp attached at 

 proximal end of molar, article 1 elongated and nearly as long as article 

 3 ; inner plate of maxilla 1 with 2 long setae, outer plate with 2 sets of 

 serrated spines; lobes of maxilla 2 equal in breadth; article 4 of maxilli- 

 pedal palp about half as long as- article 3, slender; gnathopod 2 minute- 

 ly chelate; coxa 1 very broad, partially concealing mouthparts, ex- 

 panded distally; uropod 2 with constricted inner ramus; uropod 3 

 relatively slender, peduncle distolaterally lamelliform, rami equal to 

 peduncle in length; telson truncated, apex slightly concave. 



Aruga included A. dissimilis (Stout, 1913), A. holmesi J. L. Barnard 

 (1955c), A. oculata Holmes (1908), A. subantarctica Schellenberg (1931), 

 and A. macromerus Shoemaker (1916). 



Diagnosis of Pronannonyx minimus Schellenberg (1953). — Upper 

 lip forming a linguiform lobe in front of epistome; mandibular cutting 

 edge unknown, molar apparently distally located, very small, lobular, 

 palp attachment unknown, article 1 elongated, nearly as long as 

 article 3 ; outer plate of maxilla 1 with 2 sets of spines, one set normally 

 serrated and other set smaller and apically bifid; maxilla 2 with plates 

 equally slender; maxillipedal palp scarcely exceeding apex of outer 

 plate, article 4 nearly half as long as article 3 and very slender; 

 gnathopod 2 minutely chelate; coxa 1 very broad but not concealing 

 all of mouthparts, slightly expanded distally; uropod 2 apparently 



