34 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.18 



Gnathopod 1 : article 6 shorter than article 5, palm nearly straight ; 

 article 7 almost half as long as article 6. 



Gnathopod 2 : article 6 less than half as long as article 5 ; article 7 

 about half as long as 6. 



Peraeopod 1 : seventh article more than half again as long as articles 

 5 and 6 combined ; distal anterior margin of article 4 slightly produced. 



Peraeopod 2 similar to 1 but with generic differences. 



Peraeopod 3 : posterior margin of article 5 with 6 sets of spines, ar- 

 ticle 6 with 5 spines. 



Peraeopod 4: posterior margin of article 5 with 5 or 6 sets of spines, 

 article 6 with 4 spines. 



Peraeopod 5 : inferior margin of lobe of article 2 rounded, extending 

 downward to end of article 4; article 4 slightly longer than article 3, 

 with a small, setose, posterior lobe ; articles 5 to 7 inflated, 5 and 7 sub- 

 equal in length, shorter than article 6. 



Uropod 1 extending to end of uropod 2 ; rami subequal in length to 

 peduncle ; both margins of both rami spinulate. 



Uropod 2: rami equal in size, subequal to peduncle; inner margins of 

 both rami lined with spinules, outer margin of inner ramus lined with 

 smaller spinules ; apex of outer ramus with a long spine. 



Uropod 3 : rami broadly lanceolate, outer ramus narrower than inner ; 

 inner margins of both rami lined with setae about halfway to base, outer 

 margin of outer ramus lined with spinules; upper and lower surface of 

 inner ramus sparsely covered with setae. 



Telson: lobes not tapering evenly to apex, apices very slender, only 

 slightly notched, containing 1 or 2 setae ; dorsal surface of each lobe with 

 12 to 18 setae. 



Pleon segment 3 : posterior margin strongly bisinuate ; lower posterior 

 angle produced into a strong tooth, the prominence above being large, 

 rounded, produced about the same length as the tooth. 



Pleon segment 4: posterior dorsal surface slightly raised, ending 

 posteriorly in a right angle above segment 5. 



Male: Differing from the female by the production of pleon segment 

 4 into a tall, rounded boss; pleon segment 6 strongly produced; uropod 

 3, rami slightly stouter than in female ; antennal armature typical of the 

 male ampeliscid. 



Types: Holotype, AHF no. 415, ovigerous female, 8 mm; paratype, 

 female, 9 mm. 



Type locality: Station 1321-41, 2 miles west of Church Rock, Santa 

 Catalina Island, 45 to 53 fms. 



