GAMMARIDEAN AMPHIPODA 181 



anterior edge scarcely excavate, posteroventral corner of coxa 3 pre- 

 sumably rounded-quadrate (damaged), coxa 4 with slightly oblique 

 ventral margin, posteroventral corner protruding, rounded ; pereopods 

 1 and 2 with very few posterior setae on article 5, article 6 of pereropod 

 1 with three setae ; article 2 of pereopod 5 strongly expanded, postero- 

 ventral corner of lobe quadrate, ventral margin horizontal and ex- 

 tended downward to article 3, posterior edge with coarse serrations; 

 dorsal carina moderately weak, commencing on pereonite 5 ; pleonites 

 1-3 and 5 with medium-sized, thin, acute dorsoposterior teeth, pleonite 

 4 with obsolescent tooth, all teeth straight; pleonite 4 with postero- 

 lateral blunt tooth above insertion of uropod 1 ; posteroventral corner 

 of pleonal epimeron 1 rounded, of epimeron 2 with medium-sized acute 

 tooth, of 3 with small, weakly projecting acute tooth, posterior edge of 

 epimeron 3 convex, of medium length, epimera all with 3-5 ventral 

 spine-setae; peduncles of uropods 1 and 2 lacking lateral processes; 

 telson cleft about one third of its length. 



Remarks. Mandibular palp short, article 3 very short for genus, 

 scarcely half as long as article 1 ; second articles of pereopods 3-5 

 narrow for genus, anterior and posterior margins parallel. 



?Male. — Station 7229, 5.0 mm ; peduncle of antenna 1 shorter and 

 flagellum longer than in female, accessory flagellum 3-articulate; pe- 

 duncle and flagellum of antenna 2 longer than in female, antenna 2 at 

 least two thirds as long as body, gland-cone elongated and attenuated ; 

 mandibular palp article 3 longer and more slender than in female; 

 pereopods 1 and 2 extremely slender but relatively similar in length 

 to those of female; pereopods 3-5 slender and elongated, about 1.33 

 times as long as those of female ; pereopod 4 much longer than pereo- 

 pod 5 ; article 2 of pereopod 5 strongly expanded, posteroventrally sub- 

 rounded, much broader than that of female, posterior serrations sparse 

 and weak, dactyl relatively short; dorsal teeth of pereonites and ple- 

 onites, except pleonite 3, sharper and longer than those of female, 

 pleonite 6 with erect, setose flange running circmnferentially on dorsal 

 surface, appearing acute from lateral aspect, pleonite 3 with small, 

 acute, reverted dorsal tooth ; posterior margin of pleonal epimeron 3 

 with about 10 irregular serrations; anteroventral margin of pleonal 

 epimeron 1 with one serration and lacking those spines occurring on 

 female. 



HoLOTYPE.— AHF No. 6039, female, 3.1 mm. 



TYPE-LOCALrrr.— Station 7229, 27°54'25" N, 115°40'00" W, 1720- 

 1748 m, Dec. 31, 1960. 



Material. — The holotype and a male, 5.0 mm from the type- 

 locality. 



